military vs lieutenant junior grade

military and lieutenant junior grade both are nouns.

Word	Noun	Adjective	Verb	Adverb
military	Yes	Yes	No	No
lieutenant junior grade	Yes	No	No	No

military (noun)	lieutenant junior grade (noun)
the military forces of a nation	an officer holding a commissioned rank in the United States Navy or United States Coast Guard; below lieutenant and above ensign

military (adjective)	lieutenant junior grade (adjective)
associated with or performed by members of the armed services as contrasted with civilians
characteristic of or associated with soldiers or the military
of or relating to the study of the principles of warfare