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Explosively Formed Penetrator

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A Soldier from 1st Platoon, Battery A, 2nd Battalion, 12th Field Artillery, 4th Stryker Brigade Combat Team, 2nd Infantry Division, from Fort Lewis, Wash., holds up a 12-inch copper plate used to pierce armored vehicles when fired from an explosively formed projectile. The plate was part of a large EFP cache discovered in a home in Husseiniyah, Iraq, Oct. 31, 2007.

An explosive ordnance disposal specialist member pulls a ready-to-fire explosively formed penetrator from a hidden room in a house in Sa'ada Village, Iraq, Oct. 23, 2007. Working off a tip from a concerned local citizen, coalition forces discovered a massive weapons cache in the home.
Explosively Formed Penetrator (EFP)
An explosively formed penetrator (EFP) is a shaped charge explosive device designed to penetrate armor. In the Iraq War, EFPs are a form of improvised explosive device (IED) employed by Iraqi insurgents that uses molten copper to primarily destroy heavily armored Coalition vehicles. EFP devices are made by packing a short, wide tube with explosives, capping one end and placing a detonator on that end, and placing a concave copper plate on the other end. When the EFP is triggered, the explosives in the tube partly melts the copper plate into a projectile shaped like a slug. The slug can penetrate armor and spray the inside of the targeted vehicle with metal fragments.

Shown are copper plates and bomb-making materials used for creating explosively formed penetrators captured by Iraqi army soldiers from the 44th Brigade, 11th Iraqi Army Division, in the northern area of Sadr City, Oct. 28, 2008. The large munitions capture was the second in less than a week by the IA soldiers, which included 160 blocks of C4 explosives, 34 complete explosively formed penetrators, 53 copper plates, 40 shaped plates for EFPs, three presses and a punch, all believed to be used for making EFPs, and 14 107 mm rockets.