A U.S. Air Force AC-130J Ghostrider crew operate the 105mm howitzer during live fire training in support of Trojan Footprint 21, Romania, May 7, 2021. TFP 21 is Special Operations Command Europe’s annual exercise to demonstrate proficiencies, assess readiness and lethality of our respective forces, as well as continue improving interoperability with allies and partners. (U.S. Air Force photo by Staff Sgt. Brandon Nelson)