A wreath at the 36th annual Blackthorn memorial service in St. Petersburg, Fla. (U.S. Coast Guard photo by Petty Officer 2nd Class Ashley J. Johnson) ST. PETERSBURG, Fla. — The Coast Guard honored 23 fallen crewmembers during the 36th anniversary memorial service of the Coast Guard Cutter Blackthorn collision, Thursday in St. Petersburg. The Coast Guard Cutter Blackthorn sank after colliding with...