U. S. Army vs Army National Guard

U. S. Army and Army National Guard both are nouns.

Word	Noun	Adjective	Verb	Adverb
U. S. Army	Yes	No	No	No
Army National Guard	Yes	No	No	No

U. S. Army (noun)	Army National Guard (noun)
the army of the United States of America; the agency that organizes and trains soldiers for land warfare	a civilian reserve component of the United States Army comprised of guardsmen who serve during overseas peacekeeping missions and during local emergencies