The following ranks do not include class (lc for first class and so on).

B	Boatswain’s mate
CB	Chief boatswain
CE	Chief electrician
CEM/AA	Chief electrician’s mate/Acting assignment
CK	Steward
CMM	Chief machinist’s mate
CMMA	Chief machinist’s mate acting
CMoMM	Chief motor machinist’s mate
CPO	Chief petty officer
CQM-PA	Chief quartermaster-Permanent assignment
CRM-PA	Chief radioman—Permanent assignment
CSM-PA	Chief signalman-Permanent assignment
CT	Chief torpedoman
EM	Electrician’s mate
F	Fireman
GM	Gunner’s mate
MA	Mess attendant
MM	Machinist’s mate
MoMM	Motor machinist’s mate
MoMMA	Motor machinist’s mate acting
PM	Pharmacist’s mate
QM	Quartermaster
RM	Radioman
RT	Radar technician
S	Signalman
SC	Ship’s cook
Sea	Seaman
TM	Torpedoman
Y	Yeoman