Personnel are the people employed by an organisation. Military personnel, personnel department, trained personnel.
It takes a plural verb and has no singular — one of them is a member of personnel. The department was renamed human resources almost everywhere from the 1980s, which many people regard as a change for the worse. Note the spelling against personal, and the stress on the last syllable.
1nounpersonnelThe people employed by an organisation.
“Only authorised personnel are allowed beyond this door.”
personnel is employed people.
French
personnel
English, today
personnel
French personnel. a doublet of personal.
Etymology from Wiktionary, CC BY-SA