U.S. Sailors assigned to Naval Mobile Construction Battalion (NMCB) 4 pour concrete during a sidewalk construction project Jan. 5, 2009, at Camp Lemonnier, Djibouti. NMCB-4 was on a six-month deployment to the camp in support of Combined Joint Task Force-Horn of Africa. (U.S. Navy photo by Mass Communication Specialist 2nd Class Ronald Gutridge/Released)