ELLSWORTH AIR FORCE BASE, S.D. - Senior Airman John Parris, 28th Civil Engineer Squadron heating, ventilation and air conditioning repair journeyman, throws a bag of trash into a truck for disposal during a base cleanup, April 28. More than 20 Airmen volunteered for the cleanup, saving the Air Force $4,000 in contracting costs. (U.S. Air Force photo/Airman 1st Class Corey Hook)