BAGHDAD, IRAQ - JULY 04: U.S. soldiers of the 2nd Battalion, 23rd Infantry Regiment of the 2nd Infantry Division out of Fort Lewis, Washington and an Iraqi contractor lowers a concrete wall into place between Sunni and Shia areas of the south Dora neighborhood of Baghdad.

BAGHDAD, IRAQ - JULY 04: U.S. Sgt. Troy Gittings of Fayetteville, Arkansas of the 2nd Battalion, 23rd Infantry Regiment of the 2nd Infantry Division lights a cigarette while pulling perimeter security duties protecting the building of a concrete wall.

BAGHDAD, IRAQ - JULY 04: Under headlights and the light of the moon, a U.S. soldier of the 2nd Battalion, 23rd Infantry Regiment of the 2nd Infantry Division out of Fort Lewis, Washington lowers a concrete wall into place between Sunni and Shia areas of Dora.

BAGHDAD, IRAQ - JULY 04: U.S. soldiers of the 2nd Battalion, 23rd Infantry Regiment of the 2nd Infantry Division out of Fort Lewis, Washington lower a concrete wall into place between Sunni and Shia areas of the south Dora neighborhood of Baghdad.

BAGHDAD, IRAQ - JULY 04: U.S. soldiers of the 2nd Battalion, 23rd Infantry Regiment of the 2nd Infantry Division out of Fort Lewis, Washington lower a concrete wall into place between Sunni and Shia areas of the south Dora neighborhood.

BAGHDAD, IRAQ - JULY 04: A U.S. soldier of the 2nd Battalion, 23rd Infantry Regiment of the 2nd Infantry Division conducts perimeter security duties over the building of a concrete wall between Sunni and Shia areas of the south Dora neighborhood of Bagdhad.