The Sheehan family, who are descendants of Coast Guard hero Signalman 1st Class Douglas Munro, take a tour of the 418-foot Legendary-class National Security Cutter Munro in Seattle, March 31, 2017. Currently there are 6 national security cutters in the fleet that will eventually replace the aging 378-foot cutters. U.S. Coast Guard photo by Petty Officer 2nd Class Jonathan Klingenberg.