The U.S. Army soldiers in the film are all seen wearing the PASGT helmet, which was phased out of the U.S. Army and replaced with the MICH/ACH shortly before when the time period in which movie takes place, mid-2006.
Angel Salazar's video camera, as shown in the opening scene, is a small, cheap camcorder. However, during the scene where Master Sergeant Sweet is introduced, the camera's shadow suggests a much larger high-end HD camera with wide lens and external microphone is being used.