Premise: A frigate [ ˈfrɪɡᵻt ] is any of several types of warship , the term having been used for ships of various sizes and roles over the last few centuries . USS Constitution is a wooden-hulled , three-masted heavy frigate of the United States Navy , named by President George Washington after the Constitution of the United States of America . She is the world 's oldest commissioned naval vessel afloat . During the American Civil War , she served as a training ship for the United States Naval Academy .
Hypothesis: The USS Constitution was a naval ship.
Label: ENTAILMENT