Staff Sgt. Guadalupe Mozart Retana, an aerospace ground equipment apprentice with the 161st Maintenance Group, tightens bolts to secure a diesel engine onto a B809-0108 generator, Oct. 4, at Phoenix Sky Harbor Air National Guard Base. The B809-0108 generator powers aircraft while on the flight line. Generator power conserves valuable fuel for mission use. (U.S. Air National Guard photo by Tech. Sgt. Michael Matkin)