LEARNING LANGUAGE U.S. Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, addresses students and staff at the Defense Language Institute in Monterey, Calif., Aug. 10, 2009. Troops can study more than 40 foreign languages in courses ranging in length from 12 to 63 weeks, depending on the difficulty of the language. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 771436-J-WPO67-508.jpg Photo Gallery