A.R.M.Y. - An abbreviation for "Ain't Ready to be
Marines Yet" (A.R.M.Y.). This is the saying of the Marine Corps JROTC, since the Marines are the most disciplined US military group.
Marine #1: Did you see that ARMY guy? Man, I could do all that shit like 100 times faster.
Marine #2: Yeah, well...He "Ain't Ready to be Marines Yet". What did you expect?
Marine #1: Hahaha, you have a point!