The United States Navy

Chief Warrant Officer (CWO) pay grades range from W-2 to the highest rank of W-5. United States Navy CWOs are officers whose role is to provide leadership and skills for the most difficult and demanding operations in a particular technical specialty. They occupy a niche that is not as well served by the line officer community, who tend to have a broader focus. CWOs come from the senior non-commissioned officer ranks of the enlisted and receive their commission after completing the Chief Warrant Officer Program. They typically become CWOs in specialties that are most related to their previous enlisted rating. Like Staff Corps officers, CWOs wear special insignia above the rank devices on their shoulder boards and sleeves to indicate their field of expertise.
• Enlisted sailors
Enlisted members of the Navy have pay grades from E-1 to E-9, with E-9 being the highest. All enlisted sailors with paygrades of E-4 and higher are considered Petty Officers while those at E-7 and higher are further named Chief Petty Officers. Those who demonstrate superior performance are given an increase in paygrade; the official Navy term is to be advanced. Two notable advancements are from Seaman to Petty Officer Third Class (E-3 to E-4) and from Petty Officer First Class to Chief Petty Officer (E-6 to E-7). Advancement to Chief Petty Officer is especially significant and is marked by a special induction ceremony.
Enlisted members are said to be "rated", meaning that they possess a rating, or occupational specialty. Members of grades E-1 to E-3 can become "strikers", meaning they have rating designations like Petty Officer (example: a BM3 is a Petty Officer Third Class rated as a Boatswain's Mate; BMSN is a Seaman designated as a Boatswain's Mate striker), but the striker is doing on the job training to become a rated petty officer rather than attending a school to become rated. There are more than 50 ratings covering a broad range of skills and subspecialties. However most sailors in today's navy with grades E-1 through E-6 obtain their rating through its respective "A" school. An "A" school is a rating specific school where sailors are trained as experts in their field. Upon completion of their training they are considered "Rated", regardless of their pay-grade.