Maintenance Technicians of the 175th Maintenance Group, Maryland National Guard, and 107th Maintenance Group, Michigan National Guard, install a wing flap on an A-10 Thunderbolt close-air-support aircraft at Warfield Air National Guard Base in Essex, Maryland, Friday, April 3, 2009. Michigan Guardmembers in the maintenance field are transitioning from the F-16 fighter jet to the A-10 through on-the-job training. (U.S. Army Photo by Staff Sgt. S. Patrick McCollum)