U.S. service members begin the Murph challenge with a mile-long run at Joint Base Langley-Eustis, Virginia, May 22, 2023. The challenge, named after Lt. Michael P. Murphy, a former U.S. Navy SEAL who was posthumously awarded the Congressional Medal of Honor, tests the mental and physical limitations of participants. (U.S. Air Force photo by Senior Airman Anna Nolte)