military personnel vs soldiery

military personnel and soldiery both are nouns.

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

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

Other synonyms of military personnel include troops.

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