Ken Van Dyk, 531th Commodities Maintenance Squadron, watches close circuit monitors while performing a test fire of a M61 A1 Vulcan 20mm cannon on April 7, 2016, at Hill Air Force Base, Utah. The gun is used in F-16s and is a Gatling-type with six barrels capable of firing up to 6,000 rounds per minute. (U.S. Air Force photo by Alex R. Lloyd)