Darryl Ebsch, an L-3 instructor, goes over radio frequency distribution with Airman 1st Class Jacob Martin and Airman 1st Class Tristan Patterson, both assigned to the 55th Aircraft Maintenance Squadron, Sept. 11, 2019, inside the Maintenance Training Center at Offutt Air Force Base, Nebraska. Radio frequency distribution is one of four blocks taught to electronic warfare technicians. (U.S. Air Force photo by D.P. Heard)