SAND SHOVELERS U.S. Navy Seabees use an excavator and shovels to fill barriers with sand during construction of a security wall in Tarnak, Afghanistan, April 9, 2010. The Seabees are assigned to Naval Mobile Construction Battalion 133, Detachment 6, which is in the U.S. Central Command area of responsibility. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 420539-A-JXG21-604.jpg Photo Gallery