military machine vs operational

military machine is a noun but operational is not a noun.

Word	Noun	Adjective	Verb	Adverb
military machine	Yes	No	No	No
operational	No	Yes	No	No

military machine (noun)	operational (noun)
the military forces of a nation

military machine (adjective)	operational (adjective)
	(military) of or intended for or involved in military operations
	pertaining to a process or series of actions for achieving a result
	being in effect or operation
	fit or ready for use or service