Staff Sgt. Sarah Mrak, an AC-130U Spooky aircraft aerial gunner with the 4th Special Operations Squadron, loads a 105 mm gun Feb. 3, 2011, during a training mission at Hurlburt Field, Fla. The AC-130U is the primary weapon of Air Force Special Operations Command. Its primary missions are close air support, air interdiction and armed reconnaissance. The AC-130U is equipped with side-firing, trainable 25 mm, 40 mm and 105 mm guns. (U.S. Air Force photo by Master Sgt. Jeremy T. Lock)