MAKING A JOKE U.S. Marine Gen. James E. Cartwright, vice chairman of the Joint Chiefs of Staff, makes a joke about Jon Stewart, host of Comedy Central's "The Daily Show," at the USO Metro awards in Arlington, Va., March 25, 2008. Cartwright introduced Stewart, who received the 2008 USO-Metro Merit Award. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 311770-K-HFD86-103.jpg Photo Gallery