Techncal Sergeant (TSgt) Geronimo Guerrero, a crew chief with the 149th Fighter Wing, Texas Air National Guard, San Antonio, Texas, checks the lox gauges on an F-16 as he preps the jet for a mission on April 14th, 2008. The 149FW is deployed to Davis-Monthan Air Force Base in Tucson, Arizona, participating in Coronet Cactus, an annual training mission. (Air National Guard photo by SSgt Andre Bullard) (RELEASED)