Display model of a turbine engine project from the 2023 Aerospace Propulsion Outreach Program, or APOP, symposium, April 13, 2023. APOP will hold its annual poster session at the National Museum of the United States Air Force in Dayton, Ohio, April 17, 2025, from noon to 3 p.m. APOP is a partnered outreach program for young engineers entering the workforce that offers opportunities to work with Air Force engineers. (U.S. Air Force photo)