military vs staff officer

military and staff officer both are nouns.

Word	Noun	Adjective	Verb	Adverb
military	Yes	Yes	No	No
staff officer	Yes	No	No	No

military (noun)	staff officer (noun)
the military forces of a nation	a commissioned officer assigned to a military commander's staff

military (adjective)	staff officer (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