Petty Officer 2nd Class Donnie Walker, an aviation survival technician at Coast Guard Air Station Barbers Point, discusses rappelling 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)