What does "noncom" mean?

A non-commissioned officer, such as a sergeant (army) or petty officer (navy).

Noncom

Common synonyms include: acting corporal, acting sergeant, centurion, chief warrant officer, color sergeant, corporal.

noun

noun ·Rare ·Advanced level

Noun

1
A non-commissioned officer, such as a sergeant (army) or petty officer (navy).
"Noncoms in uniform photograph you, full-face and profile; they take your fingerprints."
2
a military officer appointed from enlisted personnel wordnet

"Noncoms in uniform photograph you, full-face and profile; they take your fingerprints."

Shortening of non-commissioned.