Ensconced Engine A KC-135 aircraft engine sits inside a new maintenance shelter at the headquarters of the Pennsylvania Air National Guard's 171st Air Refueling Wing near Pittsburgh, Dec. 12, 2018. Air National Guard Senior Master Sgt. Shawn Monk SHARE IMAGE: Download Image: Full Size (1.71 MB) Tags: Air Force, National Guard Photo By: Senior Master Sgt. Shawn Monk VIRIN: 181213-Z-NQ177-1006C.JPG Photo Gallery