PC gamers know the ARMA series as wickedly difficult, painstakingly accurate military shooters - the thinking man's (or possibly masochist's) alternative to the likes of Call of Duty. For its first full mobile game, ARMA is eschewing the first person shooter genre in favor of a tactical game: a top-down, turn-based combat system where strategy wins over speed and reflexes. It's a good choice for touchscreens, and an understandable one given ARMA's current fanbase.
Armchair generals, take note: tactical games are making a comeback. This top-down micromanaging genre was once dominated by the likes of Shining Force, Tactics Ogre, and Final Fantasy Tactics (and just recently by XCOM: Enemy Unknown) but it's surprisingly perfect for touchscreen devices; see the Great Little War Game series. The ARMA series is known for painstakingly realistic shooters, but it's stepping back for Arma Tactics THD to give the player a bird's eye view of the battlefield.