Eleven years after the launch of its first Articulated Tug-Barge (ATB), Crowley Maritime Corporation christened its 17th ATB, the Liberty/750-3, yesterday at the VT Halter Marine Shipyard in Pascagoula, Miss. The tugboat and 330,000-barrel petroleum tank barge are the final vessels to be built in a more than $1 Billion, decade-long ATB construction program undertaken by Crowley to expand the company’s U.S.-flag petroleum services fleet. “We set out to offer customers the safest…