Military pallbearers carry the casket of U.S. Army Maj. Gen. Harold J. Greene during his funeral in Virginia

Military pallbearers carry the casket of U.S. Army Maj. Gen. Harold J. Greene, who held leadership positions at Aberdeen Proving Ground. He was killed in Afghanistan in August, the highest ranking U.S. military officer killed in combat since the Vietnam War. (Larry Downing/Reuters photo)

Military pallbearers carry the casket of U.S. Army Maj. Gen. Harold J. Greene, who held leadership positions at Aberdeen Proving Ground. He was killed in Afghanistan in August, the highest ranking U.S. military officer killed in combat since the Vietnam War. (Larry Downing/Reuters photo)