F.T.A Share definition Flag 2. Fuck The Army. This was a very common grafitti often seen during the Vietnam war written on walls all the way from Saigon to the Halls of Tripoli. Let's write F.T.A. on that wall over there in the graveyard with all the backwards swastikas. F.T.A by pamschel April 16, 2006 0 0 Get merch Get the F.T.A mug. Buy Now — $32.95 See more merch