Staff Sgt. Daniel Weil and Staff Sgt. Adam Hall open the ramp on a C-17 during a Home Station Check inspection on Joint Base Charleston - Air Base, May 23. HSC is a three-day inspection performed every 120 days. The inspection enables ground crews to perform preventive maintenance if needed. Sergeant Weil and Sergeant Hall work in the HSC department of the 437th Maintenance Squadron. (U.S. Air Force photo/ Staff Sgt. Nicole Mickle)

Staff Sgt. Daniel Weil prepares to operate the cargo ramp and door on a C-17 during an Home Station Check inspection on Joint Base Charleston - Air Base, May 23. HSC is a three-day inspection performed every 120 days. Sergeant Weil works in the HSC department of the 437th Maintenance Squadron. (U.S. Air Force photo/ Staff Sgt. Nicole Mickle)

Staff Sgt. Adam Hall examines warning tags during a Home Station Check inspection of a C-17 at Joint Base Charleston - Air Base, May 23. HSC is a three-day inspection performed every 120 days. Sergeant Hall is assigned to the HSC department of the 437th Maintenance Squadron. (U.S. Air Force photo/ Staff Sgt. Nicole Mickle)

Staff Sgt. Adam Hall applies grease to a fitting on the cargo ramp actuator during a Home Station Check inspection of a C-17 on Joint Base Charleston - Air Base, May 23. HSC is a three-day inspection performed every 120 days. Sergeant Hall works for the HSC department of the 437th Maintenance Squadron. (U.S. Air Force photo/ Staff Sgt. Nicole Mickle)

Senior Airman Aaron Jagow cleans and inspects the tow release mechanism on the ramp of a C-17 during a Home Station Check inspection on Joint Base Charleston - Air Base, May 23. HSC is a three-day inspection performed every 120 days. Airman Jagow is a member of the HSC department of the 437th Maintenance Squadron. (U.S. Air Force photo/ Staff Sgt. Nicole Mickle)

Senior Airman Joseph Whetstone performs an engine inspection during a Home Station Check inspection of a C-17 on Joint Base Charleston - Air Base, May 23. HSC is a three-day long inspection performed every 120 days. Airman Whetstone is a member of the HSC department of the 437th Maintenance Squadron. (U.S. Air Force photo/ Staff Sgt. Nicole Mickle)