Master Sgt. Rene Guerrero, 26 Aerial Port Squadron, explains to Mr. Cornell Richardson about the center of cargo during an upload demonstration. This was the 19th annual Employers' Day at Joint Base San Antonio-Lackland, Texas, Sat., Dec. 8, 2012. Civilian bosses of wing reservists flew aboard an Alamo Wing C-5A Galaxy, the largest aircraft in the U.S. Air Force inventory, and witnessed an in-flight aerial refueling mission with a KC-135 Stratotanker over West Texas. (Air Force photo/Tech Sgt. Carlos J. Trevino)