Chief petty officer (CPO) is the seventh enlisted rank (with the paygrade E-7) in the United States Navy[1] and U.S. Coast Guard, just above petty officer first class and below senior chief petty officer. The term "rating" is used to identify enlisted job specialties. In this way, enlisted personnel are segregated into three segments containing different enlisted ranks. Furthermore, rates are broken down into three levels: non-rated members without a designated occupation (E-1 through E-3)[clarification needed]. Advancement to E-4 and above is dependent on graduating from a specialty school that define what the enlisted is rated for. Petty officers (E-4 through E-6) and chief petty officers (E-7 through E-9) are part of the rated force and considered extremely knowledgeable about their particular rating