U.S. shipbuilder General Dynamics NASSCO has taken delivery of a new tug, Blue Fin, to support its waterfront activities. The new tug, built by Marine Group Boat Works in National City, Calif., was christened July 8 at a ceremony at NASSCO’s shipyard in Barrio Logan in San Diego. Bonnie Fanelli, the wife of 43-year NASSCO employee and assistant dockmaster Tom Fanelli, christened the tug. The name Blue Fin was selected for the new tug after NASSCO invited local K-8 students to participate in a vessel naming contest.