Big bertha
U.S. Air Force 75th Aircraft Maintenance Unit members Senior Airman Matthew Kupcho, crew chief, left, and Airman 1st Class Markes Woods, aerospace propulsion journeyman, take turns using “Big Bertha,” a 145-pound torque wrench, on one of four aft thrust mount bolts during an A-10C Thunderbolt II engine change May 18, 2015, at Moody Air Force Base, Ga. The bolts have to be torqued to 2000 inch-pounds pressure to ensure the engine can stay in place during flight. (U.S. Air Force photo by Airman Greg Nash/Released)