Answer: midshipman

AnswerCrossword Clue
MIDSHIPMANU.S.N.A. student
MIDSHIPMANRoger Staubach, once
midshipmanA naval cadet in the US Navy
midshipmanAn officer in the Royal Navy ranking below sublieutenant
midshipmanAn American toadfish with dorsal and anal fins that run most of the length of the body and rows of light organs on the underside
midshipmanformerly, the title of a young officer (orig quartered amidships) entering the navy