military man vs military personnel

military man and military personnel both are nouns.

Word	Noun	Adjective	Verb	Adverb
military man	Yes	No	No	No
military personnel	Yes	No	No	No

As nouns, military man and military personnel are synonyms defined as:

military man and military personnel: someone who serves in the armed forces; a member of a military force

Other synonyms of military man include man, serviceman.

military man (noun)	military personnel (noun)
someone who serves in the armed forces; a member of a military force	soldiers collectively
	someone who serves in the armed forces; a member of a military force