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Petty Officer Second Class insignia & U.S. Coast Guard Petty officer, second class is the fifth enlisted rate in the U.S. Navy, U.S. Coast Guard, and the United States Naval Sea Cadet Corps, just above petty officer third class and below petty officer first class, and is a non-commissioned officer. It is equivalent to the rank of sergeant in the Army and Marine Corps, and staff sergeant in the Air Force. ==Overview== Similar to petty officer third class, advancement to petty officer second class is dependent on time in service, performance evaluations by superiors, and rate (technical specialty) examinations. The advancement cycle is currently every 6 months. Only a certain number of billets (job openings for this rate) open up biannually and all petty officers third class compete. The top scorers are chosen for advancement, but only in sufficient quantities to fill the billets available. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Petty officer, second class」の詳細全文を読む スポンサード リンク
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