TAMPA, Fla. - Petty Officer 2nd Class Clarence Lombard, a crewmember at Coast Guard aids to navigation team St. Petersburg, Fla., secures a warning sign to security boom placed at bridges around Tampa Bay, Aug. 25, 2012. The Coast Guard placed security boom at bridges around the Tampa Bay region in preparation for the Republican National Convention. U.S. Coast Guard photo by Petty Officer 3rd Class Tara Molle.