Capt. David Post, a navigator with the 757th Airlift Squadron, points to a specific area on a map on Jan. 25, 2020, at Cecil Airport in Jacksonville, Florida. Post was instructing his fellow aircrew members on the flight plan for a tactical training mission that was set to take place. As a navigator, Post is required to do pre-flight briefs to ensure all aircrew members are aware of the flight plan. (U.S. Air Force photo/Senior Airman Christina Russo)