RADIO WAVES U.S. Marine Corps Sgt. Mark Leuis teaches earthquake victims how to use a hand-cranked radio at the Landing Zone 6 distribution center in Port-au-Prince, Haiti, Jan. 21, 2010. U.S. and international military units and civilian aid agencies are conducting humanitarian and disaster relief operations after an earthquake devastated the nation. Leuis is assigned to the 3rd Marine Special Operations Command. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 009453-R-NCG74-948.jpg Photo Gallery