Pay Grade	Rate	Abbreviation	Upper Sleeve	Collar and Cap
E-1	Seaman Recruit	SR		none
E-2	Seaman Apprentice	SA		none
E-3	Seaman	SN		none
E-4	Petty Officer Third Class	PO3		none
E-5	Petty Officer Second Class	PO2		none
E-6	Petty Officer First Class	PO1		none
E-7	Chief Petty Officer	CPO
E-8	Senior Chief Petty Officer	SCPO
E-9	Master Chief Petty Officer	MCPO
E-9	Master Chief Petty Officer of the Navy	MCPON
Pay Grade	Rank	Abbreviation	Collar	Shoulder	Sleeve
W-1*	Warrant Officer	WO1
W-2	Chief Warrant Officer	CWO2
W-3	Chief Warrant Officer	CWO3
W-4	Chief Warrant Officer	CWO4
* The grade of Warrant Officer (W-1) is no longer in use.
Pay Grade	Rank	Abbreviation	Collar	Shoulder	Sleeve
O-1	Ensign	ENS
O-2	Lieutenant Junior Grade	LTJG
O-3	Lieutenant	LT
O-4	Lieutenant Commander	LCDR
O-5	Commander	CDR
O-6	Captain	CAPT
O-7	Rear Admiral (lower half)	RDML
O-8	Rear Admiral (upper half)	RADM
O-9	Vice Admiral	VADM
O-10	Admiral	ADM
O-11	Fleet Admiral*	FADM
*The rank of Fleet Admiral has been reserved for war time use only. The last Fleet Admirals were in World War II. Fleet Admirals during that war were Chester W. Nimitz, William D. Leahy, Ernest J. King, and William F. Halsey.