U.S. Air Force Senior Airman Alain Alfaro and U.S. Marine Corps Cpl. Huy Tran run together at a physical training session during the Corporals Course held at Davis-Monthan Air Force Base, Ariz., June 10-24, 2011. Six Airmen attended the Marine Corps’ Corporals Course, a program that trains corporals for their transition to the NCO corps. (Courtesy photo)