Position	Symbol
Astrometrics Officer	AO
Commanding Officer	CO
Communications Specialist	CS
Computer Specialist	MS
Conn Officer	CO
Counselor	C
Engineering Officer	EO
Executive Officer	XO
Helmsman	H
Intelligence Officer	IO
Medical Officer	MO
Navigator	N
Operations Officer	OO
Science Officer	SO
Second Officer	2O or AXO
Security Officer	RO
Shuttle Pilot	SP
Tactical Officer	TO
Weapons Specialist	WS
Yoeman	Y

Grade	Rank	Abbreviation
O-10	Admiral	Adm.
O-9	Vice-Admiral	VAdm.
O-8	Rear-Admiral	RAdm.
O-7	Commodore	Comm.
O-6	Captain	Capt.
O-5	Commander	Cmdr.
O-4	Lieutenant Commander	Lt. Cmdr.
O-3	Lieutenant	Lt.
O-2	Lieutenant Junior Grade	Lt. J.G.
O-1	Ensign	Ens.