WASHINGTON, April 29, 2007 – The Marines of the 2nd Marine Aircraft Wing Band have put down their instruments and picked up their rifles to become part of the security detachment for the Tactical Air Control Center here. Marine Sgt. William Killian, a member of the Tactical Air Control Center security force, signals Marines in a Humvee to move forward so he can check their ID cards in Al Asad, Iraq, April 9, 2007. Killian is a tuba player in the 2nd Marine Aircraft Wing band. U.S. Marine Corps photo by Cpl. Zachary Dyer (Click photo for screen-resolution image);high-resolution image...