Members of the Royal Australian Air Force check in for a welcome briefing at Joint Base Pearl Harbor-Hickam Aug. 19, 2019 during fighter exercise Sentry Aloha 19-2. The exercise entails back-to-back combat sorties with visiting aircraft from visiting air national guard units and the Royal Australian Air Force. Sentry Aloha provides participants a multi-faceted, joint venue with supporting infrastructure and personnel.(U.S. Air National Guard photo by Master Sgt. Mysti Bicoy)