A 366th Training Squadron civil engineer apprentice course instructor and student communicate to other students using hand signals at Sheppard Air Force Base, Texas, March 19, 2019. They are communicating to the other students to reel just a little bit of the arresting system before they reset for another test. The mobile aircraft arresting system is made to slow down aircraft that land in rugged locations, turning fields or freeways into runways. (U.S. Air Force photo by Airman 1st Class Pedro Tenorio)