noun
career soldier; professional soldier
Refers to a person who serves in the military as a long-term profession, as opposed to a conscript or temporary recruit.
彼は職業軍人として20年間勤務した。
He served as a career soldier for 20 years.
軍人 is a general term for any military personnel, while 職業軍人 specifically denotes a professional career soldier.
Compound of 職業 (profession) and 軍人 (military personnel).