Loading 20mm Rounds into F-15's M61 Vulcan | Universal Ammunition Loading Systembr br B-Roll package featuring two separate episodes of 20 mm training rounds being loaded onto a Universal Ammunition Loading System (UALS) and to an F-15 Fighter Jet, which is fed to the F-15's internally mounted M61A1, six barrel Vulcan system, prior to a training mission. br br An F-15's M61A1 Vulcan system can carry up to 500 rounds of 20 mm ammunition.br br 00:00 - Universal Ammunition Loading System - replenishing training rounds of 20mm ammobr 01:15 - Preparing, attaching & loading 20mm rounds to an F-15 Fighter Jet's M61 Vulcan systembr br Credit: U.S. Air Force videos by Staff Sgt. K. Tucker Owen, Staff Sgt. Nicholas Dastasbr br The appearance of U.S. Department of Defense (DoD) visual information does not imply or constitute DoD endorsement.