相关规则
Spain
Practice Relating to Rule 25. Medical Personnel
Section B. Equipment of medical personnel with light individual weapons
Spain’s LOAC Manual (1996) states that military medical personnel
may carry arms for self-defence and for the defence of the wounded, sick and shipwrecked. They may not use them to avoid being taken prisoner. Using these arms in combat will terminate the protection to which they are entitled. 
Spain, Orientaciones. El Derecho de los Conflictos Armados, Publicación OR7-004, 2 Tomos, aprobado por el Estado Mayor del Ejército, División de Operaciones, 18 March 1996, Vol. I, § 4.5.b.(1)(b); see also § 9.6.b.(2).
Spain’s LOAC Manual (2007) states with regard to medical personnel of the armed forces:
Medical personnel can carry weapons to defend themselves and the wounded, sick and shipwrecked in their charge. They must not use these weapons to avoid being captured or taken prisoner. If they use these weapons in acts of war, they will lose their entitlement to protection. 
Spain, Orientaciones. El Derecho de los Conflictos Armados, Tomo 1, Publicación OR7–004, (Edición Segunda), Mando de Adiestramiento y Doctrina, Dirección de Doctrina, Orgánica y Materiales, 2 November 2007, § 4.5.b.(1).(b); see also §§ 3.2.a and 9.6.b.(2).
The manual also states:
The following are not considered harmful to the adverse party: medical personnel equipped with light individual weapons for their own defence or for that of the wounded and sick in their charge; medical units guarded by pickets, sentries or escorts … 
Spain, Orientaciones. El Derecho de los Conflictos Armados, Tomo 1, Publicación OR7–004, (Edición Segunda), Mando de Adiestramiento y Doctrina, Dirección de Doctrina, Orgánica y Materiales, 2 November 2007, § 7.3.a.(10).