Tech. Sgt. Alex Pinkerton, an aerospace propulsion craftsman from the Kentucky Air National Guard’s 123rd Maintenance Squadron, trains Airmen from the 123rd Airlift Wing on the maintenance and repair of C-130 Hercules aircraft engines at Muñiz Air National Guard Base in Carolina, Puerto Rico, on June 14, 2021, as part of Maintenance University. More than 130 Airmen from the Kentucky Air Guard trained on career-specific proficiencies during the intensive week-long course. (U.S. Air National Guard photo by Phil Speck)