opsec

short for operational security. used by military and government personnel.

"dude dont tell your girlfriend when we are deploying thats opsec"

by caffeine22 September 19, 2005

gac

acronym used by the military meaning ground assault convoy

(noun) a series of military vehicles lined up to go somewhere for a mission especially overseas.

"hey private you're riding in the gac to baghdad"

by caffeine22 September 19, 2005