Chief Petty Officer was a naval rank.
A. H. Millington served as a Chief Petty Officer onboard ship "many years" prior to 1943. (TV: The Curse of Fenric)
Smedley was a Royal Navy Chief Petty Officer serving under Captain John Hart. (TV: The Sea Devils)
Williams was Chief Petty Officer on the HMS Redoubt. (PROSE: The Face of the Enemy)