ROBINS AIR FORCE BASE, Ga. -- Jared Simmons, 566th Electronic Maintenance Squadron Avionics and Instruments electronics integrated systems mechanic with the Warner Robins Air Logistics Complex, explains the purpose of the Theodolite A-10 heads-up display tester at Robins Air Force Base, Georgia, Oct. 1, 2020. Theodolite tester displays a grid to the HUD, the theodolite measures the gridlines to properly align the display for the HUD. (U.S. Air Force photo by Joseph Mather)