The MH 53 Sea Dragon is among the largest and heaviest class of helicopters used by the U.S. Navy.Federation of American Scientists: MH-53 Sea Dragon Profile
January 2008 Crash
A MH 53 Sea Dragon flying in heavy fog crashed south of Corpus Christi, Texas, near the Gulf of Mexico, on January 16, 2008. The helicopter was reportedly on a training mission. Three crew members were killed upon impact.CNN: Navy Copter Crash Kills 3 in Texas