Marines with Alpha Fleet Antiterrorism Security Team Company move down a flight of stairs after utilizing a flash bang at a shoot house aboard the Northwest Annex during Advanced Urban Combat Training Aug. 28. The training allowed the Marines to use live rounds and flash bang grenades throughout the training to test them under a stressful situation. - Marines with Alpha Fleet Antiterrorism Security Team Company move down a flight of stairs after utilizing a flash bang at a shoot house aboard the Northwest Annex during Advanced Urban Combat Training Aug. 28. The training allowed the Marines to use live rounds and flash bang grenades throughout the training to test them under a stressful situation.