Coast Guard Petty Officer 1st Class Cory Sumner and his canine partner, Feco, prepare to conduct a vertical delivery and hoisting exercise with an Air Station San Francisco aircrew during an explosives detection demonstration on Coast Guard Island in Alameda, Calif., March 23, 2018. Sumner and Feco are assigned to the Maritime Safety and Security Team 91105, based in Alameda. Coast Guard photo by Petty Officer 1st Class Matthew S. Masaschi