Staff Sgt. Ricky Dunbar, Medical Operation Squadron NCO in charge of ambulance services, explains the capabilities of an all-terrain ambulance to Lt. Gen. Chris Nowland, 12th Air Force commander, during his visit at Ellsworth Air Force Base, S.D., April 8. 2015. Throughout the day, Nowland met with several maintenance, operations and support Airmen who successfully carry out the mission. (U.S. Air Force photo by Airman 1st Class Rebecca Imwalle/Released)