text: Chapter 4
  LOCATION OF MILITARY MEDICAL UNITS AND FACILITIES
  4-22. Responsible authorities must ensure that military medical units and facilities are, as far as possible,
  placed so as an attack against military objectives cannot imperil their safety (GWS art. 19; consider AP I art.
  12(4)). Commanders of tactical units should avoid placing their units in proximity to military medical units
  and facilities to the extent feasible. In no case may a military medical unit or facility be used to shield military
  objectives from attack. The obligation to situate medical units and facilities so that attacks against military
  objectives cannot imperil their safety is limited by practical considerations. For example, in order to perform
  their medical duties effectively, medical units and facilities may, to some degree, need to be intermingled
  with military objectives (see DOD Law of War Manual, 7.10.2.1).
  CAPTURE OF MILITARY MEDICAL UNITS AND FACILITIES
  4-23. Military medical units and facilities may be captured. In the event of capture, its personnel are entitled
  to continue to perform their medical duties so long as the capturing force has not itself ensured the necessary
  care for the wounded and sick found in the unit or facility (GWS art. 19). The material of mobile medical
  units that fall into the hands of the enemy must be reserved for the care of the wounded and sick. The material
  and stores of mobile medical units and fixed medical establishments that fall into the hands of the enemy
  must not be intentionally destroyed.
  4-24. In the event of urgent military necessity, commanders of forces in the field may make use of the
  buildings, material, and stores of a fixed military medical establishments, provided they make previous
  arrangements for the welfare of the wounded and sick who are being cared for in the establishment (see GWS
  art. 33).
  MEDICAL AIRCRAFT
  4-25. Medical aircraft, that is to say, aircraft exclusively employed for the removal of the wounded, sick, and
  shipwrecked, and for the transport of medical personnel and equipment, must not be attacked, but must be
  respected by the belligerents, while flying at heights and times, and on routes, specifically agreed upon by
  the belligerents concerned (GWS art. 36). Such aircraft, while designated or operating as medical aircraft,
  may not be used also for military purposes, such as to transport able-bodied combatants or to carry
  ammunition to combat forces (see DOD Law of War Manual, 7.14.2). Medical aircraft must obey every
  summons to land. In the event of a landing thus imposed, the aircraft with its occupants may continue its
  flights after examination, if any (GWS art. 36).
  4-26. Military medical aircraft (i.e., aircraft exclusively employed for the removal of the wounded, sick, and
  shipwrecked, and for the transport of medical personnel and equipment) must not be attacked, but are to be
  respected by the belligerents, while flying at heights and times, and on routes, specifically agreed upon by
  the belligerents concerned. The use of protected medical aircraft generally depends on an agreement between
  belligerents. However, known medical aircraft, when performing humanitarian functions, must be respected
  and protected. Such aircraft do not constitute a military objective that is liable to being made the object of
  attack. Thus, even if not flying pursuant to an agreement, such aircraft shall not be deliberately attacked or
  fired upon, if identified as protected medical aircraft. For example, if there is no agreement and a military
  force happens upon a medical aircraft belonging to an enemy State, the aircraft must not be made the object
  of attack until all other means of control (such as directing the aircraft to land and submit to search) have
  been exhausted. A medical aircraft that is not flying pursuant to a special agreement that seeks to claim
  protection as medical aircraft must make every effort to identify itself and to inform the enemy State of its
  status and operation, such as its flight times and routes. For example, an unknown aircraft within a theater of
  military operations would often be reasonably presumed to be a military objective, and the aircraft must take
  affirmative steps to rebut this presumption. In order to maintain its entitlement to protection, such aircraft
  must obey the directions of the enemy State, such as directions to land and to submit to search (GWS art. 36;
  see DOD Law of War Manual, 17.14.1).
  HOSPITAL SHIPS AND COASTAL AND RESCUE CRAFT
  4-27. Military hospital ships (such as ships built or equipped by States specially and solely with a view to
  assisting, treating, and transporting the wounded, sick, and shipwrecked) may in no circumstances be attacked