Preflight Posture Air Force Senior Airman Dylan Tyler performs preflight checks on an F-15C Eagle while supporting Exercise Crimson Warrior at Royal Air Force Lakenheath, England, Nov. 4, 2020. The exercise is designed to strengthen NATO interoperability and test high-end capabilities in a contested, degraded and operationally limited environment. SHARE: Download: Full Size (2.32 MB) Tags: Air Force, nato, crimson warrior 20 Credit: Air Force Airman 1st Class Jessi Monte VIRIN: 201104-F-PW483-0239F.JPG Photo Gallery