military machine vs half track

military machine and half track both are nouns.

Word	Noun	Adjective	Verb	Adverb
military machine	Yes	No	No	No
half track	Yes	No	No	No

military machine (noun)	half track (noun)
the military forces of a nation	a track that goes around only rear wheels
	a motor vehicle propelled by half tracks; frequently used by the military