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Petty officer - Wikipedia
U.S. Navy Ranks List - Lowest to Highest - FederalPay.org
Navy Petty Officer Second Class - Military Ranks
Chief petty officer (United States) - Wikipedia
Navy Chief Petty Officer - Military Ranks
Navy Petty Officer Third Class - Military Ranks
List of United States Navy enlisted rates - Wikipedia
How rank and rate works in the Navy - Task & Purpose
The History of Navy Rank (or Rate): Enlisted Personnel
Enlisted Navy Rates - Military.com