The crew of the Coast Guard Cutter Shackle (WYTL 65609) transits up the Penobscot River in Maine to break ice on Feb. 16, 2022. The 65-foot harbor tugs were built between 1962 and 1967 that have the distinction of operating only on the East Coast, from Maine to Virginia. (U.S. Coast Guard Photo by Petty Officer 2nd Class Ryan L. Noel)