ANDERSEN AIR FORCE BASE, Guam - Master Sgt. Bryan Mooreberg, Squad Leader from Kulis Air National Guard, stands guard as his team checks an abandoned house for potential "enemies" here during Commando Warrior Urban Operations exercise 09-1 Jan 31. The exercise used "simunitions," dye-filled rounds that fit in M4s or 9MM weapons, to train Airmen on team tactics and movement under fire in simulated combat environments. (U.S. Air Force photo by Airman 1st Class Courtney Witt)