Caught this one on Netflix over the weekend.
A squad of marines are deployed to an isolated island for a training exercise against automated enemies. A cybernetic technician is assigned to accompany them and observe the exercise.
Day one goes fine. They're dropped off on the island, they locate the robot troops, and they destroy them in an ambush.
The next day, things don't go so well. More advanced robots show up, and they're the ones laying the ambush -- with live ammunition. Turns out that maybe it's not the marines who are being trained, and no one's sure what the technician knows about what's happening.
I don't recall hearing about this one being in theaters, but it appears to have a decent budget, and the cast and crew do good work.
http://www.imdb.com/title/tt2667380