A pendulum sways back and forth measuring aircraft balance during a 721st Air Mobility Squadron training at Ramstein Air Base, Germany, Dec. 11, 2020. Airmen from Incirlik AB, Turkey, Rota AB, Spain, Spangdahlem AB, Germany and Ramstein AB attended a training to develop their maintenance proficiency on the C- 5 Super Galaxy aircraft. The 721st Air Mobility Squadron provides command and control, aerial port, and aircraft maintenance in support of the national military strategy to sustain forces worldwide. (U.S. Air Force photo by Senior Airman Thomas Karol)