Petty Officer 2nd Class Brian Rodriguez and Petty Officer 2nd Class Donnie Walker, aviation survival technicians at Coast Guard Air Station Barbers Point discuss knot tying techniques with Hyun Dai Kim, with the Korean coast guard, during a vertical surface and self rappelling exercise at Makapu'u Lighthouse, Oahu, Nov. 16, 2017. Members from the Korean coast guard visited Air Station Barbers Point during a professional exchange as a way to share best practices. (U.S. Coast Guard photo by Petty Officer 2nd Class Tara Molle/Released)