Definitions by caffeine22

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"

gac by caffeine22 September 28, 2005

opsec

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

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

opsec by caffeine22 September 19, 2005