Before Call of Duty: Modern Warfare 2 made "Oscar Mike" ("on the move") famous, I confess that I'd never heard the expression before. But that's just one phrase in a rich vocabulary of US military slang.
Website Global Post has a glossary of military terms, some of them appearing within the last decade, some of which would certainly be home in the latest shooter:
"Black" on ammo, fuel, water, etc: Out of ammo, fuel, water, etc.
Charlie Foxtrot: Clusterfuck.
Fast Mover: Fighter jet.
Gun: Not used to refer to a rifle or pistol (military pistols are referred to as "9-mil.") This is a piece of artillery or a mortar tube.
Moon Dust: Used to refer to the dust that covers southern Afghanistan and Iraq.
Pink Mist: Appears around certain types of gunshot wounds.
Rack Out: To go to bed.
Squirter: Someone, probably an enemy, fleeing from a military attack.
Tango Mike: Thanks Much.
Whiskey Tango Foxtrot: What The Fuck, Over.
If you've served in the armed forces, feel free to add more military slang in the comments section below. There are more slang terms courtesy of Global Post in the link below.
Photo: Global Post