A joint service honor guard escorts the caisson. A joint service honor guard escorts the caisson carrying the casket of former Secretary of Defense Caspar W. Weinberger as it proceeds through Arlington National Cemetery in Arlington, Va., on April 4, 2006. Weinberger took office on Jan. 21, 1981, and served until Nov. 23, 1987, making him the longest serving defense secretary to date. During his tenure in office, Weinberger spearheaded President Ronald Reagan's peacetime military buildup. Weinberger died on March 28, 2006, at the age of 88. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 262503-T-YYL42-966.jpg Photo Gallery