POW camps (Prisoner Of War), are Secondary Objectives in the game where you can gain more units. Every kind of ground and air unit can be a POW and often times the camps will have a MG Tower defending it. If you free them you will have the benefit of their unique abillities and better numbers. Ammo Dumps are always near them, shoot them to free the prisoners, or use a unit with explosive weaponry for a less time consuming way to set them free; all you need to do is shoot the wall, but this may damage the freed troops. If you happen to have a vehicle you can run it into the barbed wire. "Shoot the ammo dump or crush the fence with your vehicle!" -Admiral A-Qira
POW Camps are where infantry and/or other units are trapped and surrounded by foes. They are usually marked as secondary objectives (silver stars.) It is usually recommended to free the prisoners, as it will boost the technique score and make the mission a lot easier. They are actually quite similar to helipads, as you can only use them one time and give you more units.