Star Trek Expanded Universe
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Rear admiral is a flag officer rank that is usually between a commodore and vice admiral.

During the 24th century, the Federation Starfleet depreciated the commodore grade, replacing it with rear admiral lower half.

Also, the Hydran rank of third admiral is roughly equivalent to the Starfleet rank of rear admiral (upper half). (RIS Bouteina: "Hilbert Hotel")

Starfleet insignia

Rear admiral lower half

2350s-2360s 2360s-2370s 2373- 2380s 2390s
File:2350 - RDML (Command).png File:2366 - RDML.png File:2373 - RDML (Command).png File:2380s - RDML (Command).png File:2390s - RDML (Command).png
File:2350 - RDML (Command Alternate).png File:2366 - RDML (Command).png
29th century
File:2800 - RDML (Command).png

Rear admiral upper half

22nd century 2230s AR 2250s 2250s 2265-2270s Early 2270s
File:Earth Starfleet - RADM.png File:2230s - RADM (Command).png File:Alternate 2250s - RADM.png File:2250s - ADM (Command).png File:2265 - RADM (Command).png File:2270 - RADM (Command).png
File:2270 - RADM Sleeve.png
Late 2270s-2350s 2350s-2360s 2360s-2370s 2373- 2380s
File:2278 - RADM (Command).png File:2350 - RADM (Command).png File:2366 - RADM.png File:2373 - RADM (Command).png File:2380s - RADM (Command).png
File:2278 - RADM Sleeve (Command).png File:2350 - RADM (Command Alternate).png File:2366 - RADM (Command).png
2390s 29th century
File:2390s - RADM (Command).png File:2800 - RADM (Command).png

Other insignia

Klingon Navy
23rd century
23-klingon-rear-admiral


Enlisted ranks Etc Officer ranks Flag ranks
Starfleet
Officers
Enlisted
Misc.
CR
CA
CN
PO3
PO2
PO1
CPO SCPO MCPO
CMCPO
FMCPO
MCPOSF
WO
CDT
MID
REC
ENS LTJG LT LCDR CDR CAPT
FCAPT
CDRE
RDML
RADM
VADM ADM FADM
Kai Imperium TRN
MNX
IMUN
LGN3
LGN2
LGN1
CLGN CEN SCEN PVT PRN OP TRB
VIC
PR PTR MST LEG IMP

External links

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