U.S. Marines assigned to the 13th Marine Expeditionary Unit take a nap on the beach after an exercise near Camp Lemonier, Djibouti, April 1, 2009. U.S. Marines assigned to the 13th Marine Expeditionary Unit take a nap on the beach after an exercise near Camp Lemonier, Djibouti, April 1, 2009. SHARE: Download: Full Size (2.58 MB) Tags: Photo Essays Credit: VIRIN: 783828-V-WYJ20-971.jpg Photo Gallery