U.S. Marine Corps combat engineers and heavy equipment operators use heavy equipment vehicles to install metal culverts during a civil development project in Haji Hanif Khan, Afghanistan, March 11, 2011. U.S. Marine Corps combat engineers and heavy equipment operators use heavy equipment vehicles to install metal culverts during a civil development project in Haji Hanif Khan, Afghanistan, March 11, 2011. SHARE: Download: Full Size (6.09 MB) Tags: Photo Essays Credit: VIRIN: 705306-J-SOS48-787.jpg Photo Gallery