USO TOUR Vice Chairman of the Joint Chiefs of Staff Marine Corps Gen. James E. Cartwright shares a laugh with actor Wilmer Valderrama, star of "That 70's Show," following a USO show on Bagram Air Base, Afghanistan, Nov. 20, 2007. SHARE: Download: Full Size (0.03 MB) Credit: VIRIN: 459502-W-RRE82-523.jpg Photo Gallery