Humanitarian protections in war are denied to certain combatants under what treaty?
Combatant:  An unprivileged combatant is a person, such as a mercenary, who takes a direct part in the hostilities but who upon capture does not qualify for prisoner-of-war status. Third Geneva Convention: The Third Geneva Convention, relative to the treatment of prisoners of war, is one of the four treaties of the Geneva Conventions. Third Geneva Convention:  It defines humanitarian protections for prisoners of war.
Geneva Convention