JD Bales, mechanical engineer with Propulsion, Structures & Manufacturing Enterprise Branch of the Materials and Manufacturing Directorate, inspects an old light bulb that he removed at Joint Base Langley-Eustis, April 30, 2019.The unit did not have the necessary equipment to change the old lightbulbs until an idea was submitted through the 633d Air Base Wing Arrow Spark program. (U.S. Air Force photo by Airman 1st Class Marcus M. Bullock)