SERVICE TO COUNTRY Sgt. Major of the Army Kenneth O. Preston and his wife, Karen, react to applause for their service to the country during his retirement ceremony on Fort Meyer, Va., March, 1, 2011. Preston served in the Army for 36 years and was its longest-serving sergeant major. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 217760-E-DQG03-237.jpg Photo Gallery