U.S. Air Force Senior Airman Paul Willett, a crew chief with the 51st Aircraft Maintenance Squadron, cleans the inside of the canopy on an A-10 Thunderbolt II at Osan Air Base, South Korea, June 9, 2016.
Willett cleaned the canopy so nothing obstructs the vision of the pilot in the cockpit before training sorties are flown. (U.S. Air Force photo by Senior Airman Victor J. Caputo). Original public domain image from Flickr