Practice Relating to Rule 28. Medical Units
Mexico’s Army and Air Force Manual (2009), in a chapter on the 1949 Geneva Conventions, states: “The mobile medical units of the parties to the conflict in the field and fixed medical establishments must be respected and protected at all times.
In a section on the 1949 Geneva Convention I, the manual further states:
94. Fixed establishments and mobile medical units of the medical service must not be attacked under any circumstances and must be respected and protected at all times by the parties to the conflict.
95. The protection to which these medical units are entitled may cease if they are used to commit acts harmful to the enemy (for example, sheltering unwounded soldiers or installing a military observation post). Protection may only cease, however, after a warning has been given, setting a reasonable time limit, and after the warning has remained unheeded.
The manual also states: “Establishments ashore entitled to the protection of the  Geneva Convention for the Amelioration of the Condition of the Wounded and Sick in Armed Forces in the Field must be protected from bombardment or attack from the sea.”
The manual further states:
[The 1977 Additional Protocol I] … applies in international armed conflicts, including national wars of liberation, providing the following guarantees:
B. … [H]ospitals enjoy the same protection as military medical personnel and units.
Mexico’s IHL Guidelines (2009), in a section entitled “Basic rules of conduct in armed conflict”, states: “Do not attack medical … facilities … Ensure their protection.”
Mexico’s Code of Military Justice (1933), as amended in 1996, punishes anyone who attacks hospitals without any military necessity.