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Combatant
Conflict Specific
Use 'combatant' when referring to people directly engaged in warfare or specific conflicts. 
Neutral Term
'Combatant' is a neutral term and doesn't imply which side of the conflict the person is on. 
Non-Combatant Contrast
Distinguish between 'combatant' for fighters and 'non-combatant' for civilians or unarmed military personnel. 