Vice Adm. Clark explains the Allied Force after action review process at a Pentagon press briefing. Director of the Joint Staff Vice Adm. Vern E. Clark (left), U.S. Navy, explains the after action review process of the U.S. participation in NATO Operation Allied Force at a July 8, 1999, Pentagon press briefing as Deputy Secretary of Defense John J. Hamre (right) listens. Secretary of Defense William S. Cohen ordered the review to assess lessons learned from this operation. SHARE: Download: Full Size (0.04 MB) Credit: VIRIN: 315015-O-EOH73-218.jpg Photo Gallery