U.S. Air Force Tech. Sgt. Chris Hernandez, a 173rd Fighter Wing Aircrew Flight Equipment technician, cleans a helmet following a sortie by one of the instructor pilots during a trip to Tucson, Ariz., for dissimilar air combat training, Jan. 12-24. The wing brought five F-15 aircraft and nearly 90 people to help the 162nd Fighter Wing train fledgling F-16 pilots for two weeks. (U.S. Air National Guard photo by Master Sgt. Jefferson Thompson)