shell shocked us marine - vietnam war

american anonymous anxiety armed army away background battle black camouflage combat combatant copy covered dark death depression destruction dirt disorder distraught emotional face failure fatigue flak forces glory grief helmet holding infantry jacket leadership looking m16 man marine military mysterious pain pensive post problems ptsd rifle serviceman shadows shell shellshock shock shocked soldier sorrow space stare stress suffering traumatic troop uniform upset usa veteran vietnam vintage vulnerability war weapon worried young