SERVICE MEDAL Army Gen. Martin E. Dempsey, left, chairman of the Joint Chiefs of Staff, pins a Defense Distinguished Service Medal on Marine Corps Gen. John R. Allen during his retirement ceremony at the U.S. Naval Academy in Annapolis, Md., April 29, 2013. Allen, the former commander of the NATO-led International Security Assistance Force and of U.S. forces in Afghanistan, retired after more than 30 years of service. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 125764-D-RSG72-212.jpg Photo Gallery