military personnel vs military man

military personnel and military man both are nouns.

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

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

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

Other synonyms of military personnel include man, serviceman.

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