Combatant
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Combatant is the legal status of a person entitled to directly participate in hostilities during an armed conflict, and may be intentionally targeted by an adverse party for their participation in the armed conflict. Combatants are not afforded immunity from being directly targeted in situations of armed conflict and can be attacked regardless of the specific circumstances simply due to their status, so as to deprive their side of their support.
Afghan National Army soldiers conducting a patrol in 2011, during the War in Afghanistan. They would be considered combatants in the war.
Protected persons
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Protected persons is a legal term under international humanitarian law and refers to persons who are under specific protection of the 1949 Geneva Conventions, their 1977 Additional Protocols, and customary international humanitarian law during an armed conflict.
Medical personnel during an armed conflict carry out humanitarian work and are "protected persons" under international humanitarian law. Whether military or civilian, they are considered non-combatants and may not be attacked and not be taken as prisoners of war by parties to a conflict. They use a protective sign such as the red cross, red crescent or red crystal.