Getting it done on drill weekend
U.S. Air Force, Staff Sgt. Alvaro Ponce, an aerial propulsion journeyman with the 129th Maintenance Group, annotates serial numbers for verification, as part of the isochronal inspection, Moffett Federal Air Field, Calif., Jan. 23, 2016. The 14 day examination is part of isochronal inspection which is done every 541 days. (U.S. Air National Guard photo Staff Sgt. Kim E. Ramirez/Released)