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LESSON ASSIGNMENT LESSON 6 Medical Regulating and Patient Evacuation. LESSON ASSIGNMENT Paragraphs 6-1--6-23. LESSON OBJECTIVES After completing this lesson, you should be able to: 6-1. Identity the definition of medical regulating. 6-2. Identify the definition of intratheater and intertheater medical regulating. 6-3. Identify the USAF aeromedical elements and medical regulating elements. 6-4. Identify the movement procedures used to move patients in the USAF AE. 6-5. Identify the major classifications used for patients in the USAF AE system. 6-6. Identify and compare the organizations in the USAE AE system. LESSON 6 MEDICAL REGULATING AND PATIENT EVACUATION 6-1. MEDICAL REGULATING DEFINED Medical regulating is a casualty management system. It is designed to coordinate the movement of patients from the site of injury or the onset of disease through successive echelons of medical care to a MTF that can provide appropriate levels of medical treatment. 6-2. THEATER ARMY MEDICAL MANAGEMENT INFORMATION SYSTEM a. Medical Information Management System. The Theater Army Medical Management Information System (TAMMIS) was developed to manage the medical information of field medical units during peacetime and wartime. TAMMIS tracks patients and manages medical information at tables of organization and equipment (TOE) field medical units in the corps and EAC. 6-1 b. An Automated, On-line Microcomputer System. TAMMIS is an automated, on-line, interactive microcomputer system. It is designed to assist commanders by providing timely, accurate, and relevant medical information. c. Design. The design of the system focuses primarily on the automation of wartime operations, but it also includes peacetime functions. TAMMIS supports readiness missions while in garrison and during training exercises, thus ensuring a rapid transition from peace to war. TAMMIS provides vertical integration of medical information through C2 or the medical command control (MEDC2) function. Through predetermined reports or ad hoc reporting, TAMMIS provides a data rollup capability which contains the status of medical units, evacuation workloads, and critical resources. TAMMIS is capable of interfacing with Department of Defense (DOD) medical management information systems, such as the Defense Medical Regulating Information System (DMRIS), and ultimately, the Composite Heath Care System (CHCS). TAMMIS was adopted by DOD as the interim baseline wartime system for the quad-service tactical medical information system. d. Security Features. TAMMIS has security features that control user access to the system. During system setup, the local manager establishes each user's accessibility to each part of the system through system setup files; the user will be able to view only the portion of the system that pertains to his job responsibilities. The local manager can also adjust the system to accommodate local requirements and the operating environment of his unit. e. Modes of Relaying Information. TAMMIS can relay information between units in various ways. The preferred method involves direct communication links between computers through a military communications system. Because communications cannot be assured in wartime, units can also pass information via floppy diskette or tape delivered by courier. Both methods preclude having to re-enter data. f. Practically Hardware Independent. The design of TAMMIS makes it practically hardware independent because of the use of the multi-user, multitasking operating system (UNIX). 6-3. THE MEDICAL PATIENT ACCOUNTING AND REPORTING SYSTEM a. Purpose of Medical Patient Accounting and Reporting. The Medical Patient Accounting and Reporting (MEDPAR) subsystem supports facility commanders in the management of patients and resources. The system tracks patients for casualty reporting and personnel strength accounting purposes. b. System Organization. The MEDPAR system is divided into menus, each containing subcategories called menu items. Each menu item explains a procedure within its menu. For instance, the patient admission and disposition menu contains the 6-2 enter/update admissions and pre-admissions menu item for entering patient admission data. c. Medical Patient Accounting and Reporting Functions. The MEDPAR system has the capability of communicating with other MEDPAR systems, Medical Regulating (MEDREG), and Standard Installation/Division Personnel System (SIDPERS). When patients are to be transferred from a hospital, coordination must be made with MEDREG, which will coordinate with transportation units to move the patients. 6-4. THE THEATER EVACUATION POLICY a. Responsibility for Setting Policy. The evacuation policy is set by the Secretary of Defense with advice from the Joint Chiefs of Staff and recommendations from the Theater Commander. (The Surgeon General provides medical advice to the Chief of Staff.) b. Definition of the Army Policy. Theater evacuation policy establishes the maximum period of noneffectiveness, hospitalization, and convalescence that patients may be held within the theater. c. When Period of Noneffectiveness Begins. The period of noneffectiveness begins when a patient is admitted to a corps hospital. d. Effect of Evacuation Policy on the Combat Health Support System. The evacuation policy can have a domino effect in terms of the strain it exerts on the resources of the CHS system. For example, the longer the evacuation policy, the more beds that will be needed in theater, with the probable result that there will be a greater need for a FH with convalescent care. More treatment, in turn, necessitates more Class VIII medical supplies. 6-5. FACTORS AFFECTING THE EVACUATION POLICY There are five factors that determine the evacuation policy. They are: a. Mission, equipment, terrain, troops, and time (METT-T). b. Number and type of patients. c. Evacuation assets available. d. Availability of replacements. e. Availability of in-theater resources. 6-3 6-6. ADJUSTMENTS TO THE EVACUATION POLICY a. Patients Not Requiring Treatment in an Echelons Above Corps General Hospital. The evacuation policy may be adjusted to retain or RTD those patients who do not require treatment in an EAC GH. b. When Increased Patient Load is Anticipated. The evacuation policy may also be adjusted in order to make additional beds available when increased patient loads are anticipated. Suppose that our forces are going on the offensive or undertaking a counterattack. In such cases, it will be necessary to lower the evacuation policy. This will free up beds in order to prepare for operations. 6-7. PLANNING FOR MEDICAL REGULATING Careful planning is required in order to adequately control patient evacuation to hospitals so that there is an even distribution of patients, there is an adequate number of beds for current and anticipated needs, and patients requiring specialized treatment are routed to the proper MTFs. a. Categories of Medical Regulating. There are two broad categories of MEDREG: intra-theater and inter-theater MEDREG. Intra-theater MEDREG encompasses movement anywhere from the corps to EAC, for example, from a CSH to a GH. Inter-theater MEDREG occurs between EAC and CONUS. b. Informal Medical Regulating (Tracking). Informal medical tracking of the patient occurs from the company aid post to the BAS, from the BAS to the FMSC, and from the FSMC to the corps hospital. The informal regulating/tracking system is used to avoid exclusive dependence on the formal communications system. 6-8. THE DIVISION MEDICAL OPERATIONS CENTER a. Responsibilities. The medical group/brigade medical regulating officer (MRO) of the division medical operations center (DMOC) coordinates and directs patient evacuation from division level MTFs to corps level MTFs. When an ambulance departs from the FSMC with a patient, the FSMC contacts the DMOC in order to provide a specific set of relevant information. b. Patient Disposition and Reports Branch. This branch of the DMOC fulfills a number of important MEDREG and tracking functions. 6-9. MEDICAL REGULATING PERSONNEL AND AGENCIES a. The Medical Regulating Officer. The MRO has three responsibilities: (1) Receives and consolidates evacuation requests. 6-4 (2) Determines resources available to move patients. (3) Maintains current information. b. Patient Administration Specialist. Patient administration specialists (MOS 71G) are located in the FSMC/MSMC, DMOC, and corps hospitals. c. The Global Patient Movement Requirements Center (GPMRC). This office was formerly known as the Armed Services Medical Regulating Office (ASMRO). It authorizes patient transfers to CONUS and determines the destination hospital. d. The Joint Medical Regulating Office. The Joint Medical Regulating Office (JMRO) is a joint agency consisting of two or more services. It regulates the movement of patients within the TO and back to CONUS. 6-10. MEDICAL EVACUATION IN THEATER a. The Unified Commander's Responsibilities. The unified commander is responsible for: (1) Evacuation of formally captured and detained U.S. military personnel. (2) Evacuation of EPW and civilian internees, other detainees, and civilian (3) Policy and procedure for evacuation of military working dogs. patients. b. Department of Defense Policy on Aeromedical Evacuation. In both peace and war, the movement of patients of the armed forces will be accomplished by airlift, unless medically contraindicated. This assumes, of course, that AE is available and that conditions are suitable for this mode of evacuation. c. The Air Mobility Command. The air mobility command (AMC) is responsible for: (1) All domestic AE. (2) Inter-theater evacuation. (3) Intra-theater evacuation, except for evacuation from the CZ and from routes solely of interest to the United States Navy (USN). d. The Army Component Commander. The commander provides AE by organic Army aircraft within the CZ. 6-5 e. The Navy Overseas Component Commander. The commander provides AE over routes solely of interest to the USN when USAF facilities cannot provide this service. 6-11. PATIENT MOVEMENT PRECEDENCE Overclassification must be avoided. It is important to the patient's welfare to properly assign patient movement precedence. Overclassification must be avoided to prevent unnecessary hardship to patients on flights that might be diverted. Proper evaluation can also avoid unnecessary, costly, hazardous, or special flights. 6-12. THEATER AEROMEDICAL EVACUATION (PRECEDENCE CLASSIFICATION) The three classifications of patients are given below. The "urgent" classification is not used for psychiatric cases or for terminal cases with very short life expectancy. a. b. c. Urgent. Emergency cases that must be moved immediately: (1) To save life or limb. (2) To prevent complication or a serious illness. Priority. (1) Patient requires prompt medical care not available locally. (2) Evacuate within 24 hours and delivered with least possible delay. Routine. (1) Evacuate within 72 hours. (2) Use routine or scheduled flights. 6-13. AEROMEDICAL EVACUATION ELEMENTS a. The Aeromedical Evacuation Coordination. The AE system does not own any aircraft. Aeromedical evacuation movements are requested through the Aeromedical Evacuation Coordination Center (AECC), the brain of the USAF's AE center. The AECC manages the AE system and is responsible for overall planning, coordinating, and directing of AE. b. Aeromedical Evacuation Liaison Team. The aeromedical evacuation liaison team (AELT) is the communications link between the user service and the AE 6-6 system. To ensure smooth patient flow, the AELT is collocated with the user service (which can be an MTF). The AELT consists of two medical service corps officers, one flight nurse, and three radio operators. 6-14. MOBILE AEROMEDICAL STAGING FACILITY a. Defined. The mobile aeromedical staging facility (MASF) is a temporary holding facility equipped and staffed to receive patients, sustain life, and administratively process patients. The MASF is the entry point of patients into the USAF's AE system. b. Location. The MASF is normally located near the runways or taxiways of airfields or forward operating bases, where tactical airlift aircraft resupply combat forces. c. Facility. Strength, Staffing, and Capabilities of the Mobile Aeromedical Staging (1) Authorized strength: 39. (2) Types of personnel authorized: flight nurses, aeromedical technicians, radio operators, and ground ramp operators. (3) d. Physicians: none, but can be called in as required. Mobile Aeromedical Staging Facility Capabilities. (1) Patients: 50 patients, for 4 to 6 hours, no overnight holding capability. (2) Organic patient transport: none. (3) Patient food service: none. (4) Special equipment/supplies: must be provided by MTF. e. Functions of the Mobile Aeromedical Staging Facility. Six functions of the MASF are to: (1) Receive casualties requiring AE from forward medical elements. (2) Provide supportive nursing care to casualties awaiting airlift. (3) Prepare administrative paperwork. 6-7 (4) Assist AE crews in configuring aircraft to receive litter and ambulatory (5) Notify the AECC when AE aircraft has departed. (6) Provide status and capability reports to AECC. patients. f. Responsibilities of the Originating Military Treatment Facility. The originating MTF provides transportation to MASF, supplies and equipment, and guards or attendants. 6-15. AERO5EDICAL EVACUATION CREWS The usual AE crew consists of two flight nurses and three AE technicians. There are no physicians in an AE crew. The AE crew prepares patients for evacuation and provides limited in-flight nursing care. 6-16. THE STRATEGIC AEROMEDICAL EVACUATION SYSTEM a. Definition. The strategic AE system provides patient evacuation between the TO and another theater or between the TO and CONUS. b. Aircraft. The aircraft normally used are the C-131 (Hercules), the C-141B (Starlifter), and the B-767. c. The Aeromedical Staging Facility. (1) Location: strategic interface airfields (normally EAC). (2) Capacity: 50 to 250 beds. (3) Overnight holding capacity: cots and beds for overnight patients. 6-17. DOMESTIC AEROMEDICAL EVACUATION SYSTEM The domestic AE system airlifts patients from aerial ports of entry or debarkation to and between federally operated medical facilities in CONUS. This includes AE from near-offshore installations. 6-18. RESPONSIBILITIES OF THE ATTENDING PHYSICIAN a. Diagnosis and Decision to Transfer. The attending (referring) physician makes the diagnosis and the decision to transfer the patient. He is responsible for all medical care until the patient reaches the destination facility. 6-8 b. Patient Movement Precedence. The attending physician makes the assignment as to patient movement precedence. c. Patient Classifications. The attending physician determines the patient's classification for evacuation. (1) Class 1: neuropsychiatric patient. (2) Class 2: litter patient (other than psychiatric). (3) Class 3: ambulatory patient. (4) Class 4: infant. (5) Class 5: outpatient. (6) Class 6: nonpatient. 6-19. A MEDICAL REGULATING SYSTEM SCENARIO a. Patient Evacuation to the Forward Support Medical Center. The hypothetical patient in question is to be evacuated to the FSMC and stabilized. The patient will require surgery and evacuation. The FSMC notifies the DMOC. The DMOC coordinates with the group MRO. b. The Patient Administration Disposition Request. The patient administrator (PAD) relays the request to evacuate to the MRO at the medical group. c. From Medical Regulating Officer to Medical Brigade Medical Regulating Office. The group MRO relays the need to evacuate the patient to the medical brigade MRO who contacts the JMRO to obtain a bed for the patient. The JMRO locates the bed and specialty service, if required, and relays the information back to the MRO. d. From Medical Regulating Officer to Aeromedical Evacuation Liaison Team. The MRO contacts the AELT to prepare AE transportation. When the request is received by the AELT, a radio call is made to the AECC. e. Back to the Patient Administration. The MRO then relays the information back to the PAD. The patient is then transported, having arrived 2-4 hours prior to aircraft arrival to allow for MASF personnel to conduct administrative duties and triage. 6-20. JOINT CASUALTY EVACUATION OPERATIONS IN THE COMBAT ZONE Regardless of the circumstances that may require the National Command Authority to enlist the services of the Army's light forces, the next contingency will 6-9 almost certainly require a rapid deployment into an undeveloped theater, necessitating detailed logistics planning. This logistics strategy will be punctuated by a health service support (HSS) plan that particularly addresses the issue of casualty evacuation. a. Austere Division and Corps Medical Support. Forced-entry operations and establishment of a lodgment present unique challenges for medical units. With no corps level medical support immediately available, and perhaps only an austere tailored package of division Level II support during the initial phases of the operation, medical units must rely on the USAF's theater airlift resources to evacuate casualties. b. The United States Air Force's Airlift Services. At the Joint Readiness Training Center (JRTC), units quickly recognize the invaluable service that USAF airlift can provide in accomplishing casualty evacuation. Unfortunately, the exploitation of these valuable assets is not well publicized and, consequently, the Army units may be unfamiliar with the coordination necessary for proper execution. c. Violation of Combat Health Support Principle of Continuity of Care. Most units are inclined to load casualties on any aircraft arriving at the airhead. While this may seem efficient, it violates an absolute principle of CHS operations, that of continuity of care. Loadmaster and aircraft crews are neither capable nor qualified to provide the medical care necessary for preserving life. Will they be able to maintain an intravenous line on patients suffering from hypovolemic shock? Can they manage the flow rate of oxygen? Can they administer analgesics or other medication? Will they be able to change bandages or perform chest decompression in the event thoracic injuries escalate into a pneumothorax? Are they trained to maintain an airway? And to further complicate matters, without previous coordination, who is responsible for accepting casualties from this aircraft at its arrival airfield? The benefit of evacuation never obviates the need for continuity of care and certainly would not be worth the number of severely wounded who would not survive the flight without treatment while en route to definitive care facilities. 6-21. INTRA-THEATER ORGANIZATION Most logistics planners are familiar with the role of the USAF in conducting theater, strategic, and CONUS AE. The use of aircraft such as the C-141 B Starlifter or C-9 Nightingale for casualty evacuation from corps hospitals to EAC is generally understood. Brigade and battalion staffs, however, may not be aware that the USAF, specifically Air Combat Command, maintains units solely dedicated for casualty evacuation even within the division area of operations (AO). a. United States Air Force's Worldwide Aeromedical Evacuation Mission. The mission of the USAF worldwide AE system is to transport casualties by fixed-wing aircraft, under medical supervision, from forward airfields in the CZ to points of definitive medical care within the CZ. From the CZ, casualties are transported to medical care within the EAC (intra-theater) and from EAC to CONUS (inter-theater). 6-10 b. Aeromedical Evacuation Squadron. An aeromedical evacuation squadron (AES) is composed of operational medical elements that conduct AE through an interrelated network. c. Aeromedical Evacuation Liaison Team. Ideally, an AELT is collocated with the Army medical units in the division and corps AO. The six members of the AELT include two Medical Service Corps officers who control AE operations, a Nurse Corps officer who provides clinical and patient preparation support, and three communications specialists who operate the team's high-frequency radio systems that provide the direct channel between the requesting unit and the AECC. The team is organized to provide 24-hour continuous operations. The AELT can be tailored, depending on the mission, but perhaps its most pertinent feature is its flexibility in deploying readily with any of the Army's airborne, air assault, and light infantry divisions. The AELTs can insert with the initial forces arriving in the CZ and immediately facilitate casualty evacuation by communicating with the AECC to coordinate the use of aircraft arriving at the airhead. It is certainly preferable to plan a staging time for the first "casualty back haul" following combat operations. But the AELT gives medical units a distinct advantage in their ability to adjust their plans and communicate their needs to the AECC based on enemy contact, accessibility of casualties, or other unforeseen events. Additionally, AELT's provide direct support to the treatment squads within the BASs or medical companies in both triaging and packaging patients with special consideration for pressurized flight. d. C-130 Hercules. The most commonly used and preferred aircraft for evacuation within the CZ zone is the C-130 Hercules. The C-130 can land and take off on short, unimproved runways, facilitating rapid transportation of personnel and equipment. When these aircraft are properly coordinated through the AECC, they may arrive configured with litter stanchions and an AE nursing crew tailored to support the needs of the patients. A C-130 configured with litter stanchions for patient evacuation can accommodate a maximum of 74 litters or 92 ambulatory patients. A mix of 50 litters and 27 ambulatory patients is also possible. With consideration to crew composition, medical equipment, and patient baggage, patient loads should generally not exceed 50 litters. Should rapid loading be required without internal configuration of the aircraft, the C-130 floor can be loaded with 15 litter patients. e. Reconfiguring an Aircraft. As the force buildup continues and the airhead expands, the AELT has visibility and access to most other USAF aircraft arriving in the AOs. This provides the combat commander with tremendous added flexibility in properly evacuating his patients. Following combat off loads on the flight landing strip, a seasoned AE crew can reconfigure an aircraft for patient evacuation, using litters stowed in its cargo compartments, in approximately 15 minutes. 6-11 6-22. COORDINATION OF INTRA-THEATER EVACUATION a. Aeromedical Evacuation Control Center (AECC). The theater AE system does not possess a dedicated fleet of evacuation aircraft. Aeromedical evacuation movements are requested through the theater airlift request system just like any other airlift request. When a medical unit announces that stabilized patients are ready for movement, the AELT communicates this requirement to the AECC. The AECC is the operations center where the overall mission planning, coordinating, and the monitoring occurs. The AECC is a function of the theater air operations center and coordinates directly with the air mobility element for airlift execution. b. Aeromedical Evacuation. When a mission is scheduled, the AECC transmits the mission data and other pertinent information back to the AELT as well as to other elements in the AE system. When an AE mission is requested and identified, an AE crew is alerted to support the mission. AE crews provide the in-flight supportive nursing care aboard the evacuation aircraft. These crews are responsible for ensuring that aircraft are properly configured and loaded. An individual AE crew consists of five personnel: two flight nurses and three aeromedical technicians. The crew can be tailored, however, depending on the mission. 6-23. EXECUTION OF INTRA-THEATER EVACUATION a. Detailed Plan for Preparation, Movement and Staging, and Loading Phases of Aeromedical Evacuation Needed. Now that a network has been established for effective coordination of AE assets, what are some of the techniques and procedures applicable to proper execution? As is always the case, detailed planning is an absolute necessity in ensuring mission accomplishment. The patient evacuation plan should address three separate phases: preparation, movement and staging, and loading. b. Preparation for Aeromedical Evacuation. (1) Verifying documentation. Attending medical personnel and PAD specialists must first ensure all required documentation be completed on evacuees. Medical units should possess Department of Defense (DD) Forms 601 and 602, Patient Evacuation Manifest and Patient Evacuation Tag, and the forms must be properly annotated for AE missions. If these forms are not available, a manifest can be created for the AE crew, which lists each patient's name, rank, social security number, unit, patient classification, destination facility, and an emergency point of contact. A DD Form 1380, U. S. Field Medical Card, may be used in lieu of a patient evacuation tag, if necessary. However, it must indicate primary and secondary diagnoses, correct patient data, and special orders for en route care, medications, and diet. (2) Packaging of patient. It is a Army unit responsibility to properly "package" the patient. Tactical aircraft will not arrive with many amenities and normally 6-12 will require significant support from the originating medical facility. A litter patient should be prepared with two blankets and two litters straps. The attending physicians must ensure that 1 to 3 days' supply of medications and rations accompany their patients. Patients are transported with their valuables, personal effects, chemical protective gear, and medically essential items. Baggage is usually restricted to 66 pounds per patient. (3) Organizing and inspecting loading teams, drivers, transportation, and equipment. Next, loading teams, drivers, transportation, and equipment must be organized and inspected. Backward planning will solidify the schedule, and rehearsals will affix responsibilities for each member in the operation and identify possible contingencies. c. Movement and Staging. United States Air Force liaison teams normally prefer that staging occur no less than 1 hour before the arrival of the aircraft. This ensures the mission is still valid and prevents delays in loading that subject the aircraft to greater hazard and restricts other operations on the flight landing strips. If the airfield is not in the immediate AO, map and route reconnaissance will be necessary to determine scheduling for each phase of the operation. Security escorts should be available for the reconnaissance and during movement to the staging area. Upon arrival at the airfield, a site should be selected that will provide ready access to the aircraft. If there are several aircraft in one serial arriving at the airfield, it is usually most appropriate to plan the AE mission on the last aircraft arriving on the flight landing strip. Units must also coordinate with the airfield combat control team (CCT) or responsible airfield operations element to position the staging facility in an area that best accommodates the operation. The CCT leader may allow the use of his operational area depending on the tactical situation. d. Loading. (1) Positioning personnel and vehicles. Patients, personnel, and vehicles should be no closer than 60 feet from the edge of a taxiway or 100 feet from the edge of a runway. When the aircraft arrives, a CCT or qualified aircraft marshal will position the aircraft. (2) Control points. Once the staging area has been established, control personnel prepare for load operations. Three control personnel are necessary for efficient loading. Control point one is normally a member of the USAF flight medical crew. This individual is positioned on the ramp of the aircraft and is the focal point for the entire operation. Control point one will communicate movement of patients using hand and arm signals. Control point two is a member of the medical team and is positioned at the safe vehicle distance (approximately 50 feet) from the rear of the aircraft. Control point two manages the smooth flow of casualties either directly from the staging facility or from vehicles he directs to his point directly on the flight landing strip. Control point three is responsible for the entire operation. He conducts final 6-13 checks on each departing patient and ensures continuity of care and completion of administrative data. Control point three supervises organization of litter teams, movement of vehicles, and handling of patients. (3) Aircraft arrival. When the aircraft arrives, personnel need to remain alert and watch for wingtip clearance. The staging team will signal the aircraft marshaled to indicate proper wingtip clearance and make sure the aircraft is properly positioned IAW the plan. For tactical operations, the aircraft will most likely remain running. Once the ramp is lowered, one person should approach the aircraft. Two individuals will be on the ramp: the aircraft loadmaster and the AE medical crew director. The AE medical crew director needs the manifest, patient load numbers (both litter and ambulatory), and any other pertinent data. (4) Loading patients. The AE medical crew director will notify the load teams when the aircraft is prepared for loading. This could be as soon as the ramp touches the ground if the mission is strictly to conduct casualty evacuation. Ambulatory patients are loaded first and should be accompanied by no less than two medical personnel to assist them onto the aircraft. Medical condition of patients will dictate if more personnel are necessary. Litter patient load teams should be organized as fourman teams until they reach control point two, then switch to two-man teams as they approach the rear of the aircraft. The tailgate ramp will only accommodate a two-man litter carry, and litter patients should be loaded feet first. As is the case with all casualty evacuation missions, the most critically wounded should be loaded last to make them readily accessible at the arrival airfield. (5) Time factors. It requires approximately 5 minutes per litter patient and 3 minutes per ambulatory patient for loading. A load team for ten ambulatory patients and ten litter patients should require no fewer than ten personnel. 6-14