Lance Cpl. Benjamin Cool (left) ties detonation cord used to link together C4 explosive charges, while Cpl. Josh Czerepka places several blocks of C4 in a small hole, known as a "murder hole” used as a firing point in an insurgent-built fighting position, March 5, 2012.

Both Marines are combat engineers attached to 3rd Platoon, Bravo Co., 1st Bn., 8th Marines.

Photo by USMC Sgt. James Mercure