Vice Adm. Clark explains the after action review process of U.S. participation in Allied Force. Director of the Joint Staff Vice Adm. Vern E. Clark, 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. Secretary of Defense William S. Cohen ordered the review to assess lessons learned from this operation. SHARE IMAGE: Download Image: Full Size (0.04 MB) Photo By: VIRIN: 251944-P-QND22-913.jpg Photo Gallery