An Iraqi army non-commissioned officer (right) and U.S. Army 1st Lt. Bryan Gerhart (left) of B Troop, 5th Cavalry, 73rd Regiment, 3rd Brigade Combat Team, 82nd Airborne Division, trade unit patches in a gesture of friendship and goodwill during a joint patrol of Muhallahs 710 and 712, in Muthana Zayuna, eastern Baghdad, Iraq, on Jan. 2, 2009.