U.S. Air Force Master Sgt. Charles Wahl, 52nd Maintenance Squadron NCO-in-charge of accessories section, briefs a class during the Master Resiliency Training Course held at Spangdahlem Air Base, Germany, March 13, 2019. The week-long training certified Resilience Training Assistants to Master Resiliency Trainers. (U.S. Air Force photo by Senior Airman Preston Cherry)