A 2000 pound inert Guided Bomb Unit 24 impacts the target area during the 2nd Air Naval Gunfire Liaison Company, II Marine Expeditionary Force, close air support exercise Sept. 11. An F-15 from 333rd Fighter Squadron, based out of Seymour Johnson Air Force Base, dropped the GBU-24. - A 2000 pound inert Guided Bomb Unit 24 impacts the target area during the 2nd Air Naval Gunfire Liaison Company, II Marine Expeditionary Force, close air support exercise Sept. 11. An F-15 from 333rd Fighter Squadron, based out of Seymour Johnson Air Force Base, dropped the GBU-24.