Gen. Stanley A. McChrystal and Secretary Gates approach the Fort McNair parade grounds. Gen. Stanley A. McChrystal and Secretary of Defense Robert M. Gates approach the Fort McNair parade grounds to begin McChrystal's retirement ceremony on July 23, 2010. McChrystal retired from the U.S. Army after 34 years of service to his nation during both peace and wartime. SHARE: Download: Full Size (0.04 MB) Credit: VIRIN: 277524-H-OPZ43-767.jpg Photo Gallery