Carbon Costume

Colonel Adrian Shephard is the main protagonist of the video game Half-Life: Opposing Force.  Colonel Shephard is a member of the United States Marine Corps sent to Black Mesa Research Facility to help eliminate alien invaders.  Shephard wears white camo with a green tactical vest, camouflage helmet, and a gas mask.  To recreate his mask, you can use some window tint film to update a cosplay mask with clear lenses, which is much easier to find.