"If You Ain't AMMO, You Ain't Shit"
Anti-Radar Missile
Foxtrot Oscar (i.e. F*ck Off) (US/UK Forces)
Acronyms are words that are usually abbreviated with the first character of each word. It is a way to convey information faster. Like the computer industry, the military is chock-full of acronyms.
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Source: Wikipedia.