Photo by Senior Airman Nicholas Ross | 355th Wing | 05.19.2021
Airmen from the 355th Equipment Maintenance Squadron operate a hyraulic ground power unit at Davis-Monthan Air Force Base, Arizona, May 19, 2021. Hydraulic power units, sometimes called hydraulic mules, provide hyraulic pressure to operate aircraft systems during maintenance.(U.S. Air Force photo by Senior Airman Nicholas Ross.)...