US Military Academy vs United States Military Academy

US Military Academy and United States Military Academy both are nouns.

Word	Noun	Adjective	Verb	Adverb
US Military Academy	Yes	No	No	No
United States Military Academy	Yes	No	No	No

As nouns, US Military Academy and United States Military Academy are synonyms defined as:

US Military Academy and United States Military Academy: a school for training men and women to become officers in the United States Army

US Military Academy (noun)	United States Military Academy (noun)
a school for training men and women to become officers in the United States Army	a school for training men and women to become officers in the United States Army