31st RQS: search rescue swiss army knife
U.S. Air Force pararescuemen, from the 31st Rescue Squadron, review knot-tying methods in a classroom setting at Kadena Air Base, Japan, March 23, 2021. Due to the complex nature of high-angle rope rescues, pararescuemen must be proficient in a multitude of knots and rope systems. (U.S. Air Force photo by Airman 1st Class Stephen Pulter)