Okay, so one of the things that's really bothered me from the beginning is the fact that units in ARMA 3 say "attack" instead of "target" like in previous ARMA games.
This may sound minor, but it really ruins the fun of eg. ambushes. It used to be awesome preparing ambushes, or simply invading an enemy camp using stealth. To ask your units to hold fire, target specific units (not attack them), then finally give the FIRE! command and watch them taking down the enemies.
It's just wrong as it is now, when you tell them to target, and your unit says "attack" instead. "All, hold fire and attack that man!", is basically what the unit says now.
It's fine to have an "attack" phrase too, but units should say "target", at least if units are in a HOLD FIRE state.