Another installment from the Hell and Gone website is long overdue, so here it is:
DD214: Official discharge form; "walking papers;" ticket to the World.
Deck: Floor or ground (navy/marine term).
Delta Force: A semi-secret subunit within the US Army portion of SOCOM, organized for direct action in counterterrorist ops, hostage rescue, etc.
DEVGRU: Short for "Development Group"--unofficially "Seal Team 6," a sub-unit within the Navy SEALs with a mission similar to Delta Force.
Didimau: Leave, run, escape, evacuate. (Vietnam era.)
Dittybop: To walk at civilian speed, usually with a swagger.
DILLIGAF: "Does it look like I give a (flute)?"
Dinki-dau: Insane; nutso; loony; whacked-out. (Vietnam era.)
Fartsack: A sleeping bag.
Fast mover: Jet fighter, jet bomber or jet attack aircraft (not counting the A10).
FNG: "F(lipping) New Guy"; a rookie; cherry; newbie.
Frag: Noun: Fragmentation grenade. The famous WWII/Korea "pineapple" type was replaced by a "baseball" type during Vietnam. Verb: To assassinate a unit member--usually an officer or NCO--in the field.
Front Lean-and-rest: The position from which push-ups are executed. There is no resting (or leaning, for that matter) involved. "Lean'n'rest" for short.
FUBAR: F(ouled) up beyond all recognition. (Originally a navy term, WWII era. Used by characters in Saving Private Ryan probably because the technical advisor was a marine.)
F(orget) the dumb s(tuff): Just get the job done, and don't waste time and effort going by the book, following assinine regulations or adhering to strac SOPs.