Explosive Ordnance Disposal Airmen perform the Extended Cross Knee Crunch Metronome component of the EOD Tier 2 Physical Fitness Test Prototype at Dover Air Force Base, Del., Aug. 8, 2018. The Tier 2 Physical Test prototype is designed to measure Airmen's ability to perform critical mission tasks for specific Air Force Specialty Codes. (U.S. Air Force photo by Staff Sgt. Damien Taylor)