A Florida teenager who fought back against an alligator attack last week has his sights set on joining the Marine Corps. Andrew Hudson, 17, was swimming with friends in Little Econ River near Geneva, Fla., on July 9 when a alligator swam up behind him and pulled him under, Fox Orlando reported. Hudson told Fox he never saw the almost 10-foot gator approaching. [HTML1] “All I felt was a big thud and felt the pressure on my head, and just straight took me under,” Hudson told Fox. “I felt like the belly of him on my back and on my…