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")

The Lyran Starfleet rank of senior commodore is roughly equivalent to rear admiral (upper half). (Star Trek: The Stoneship Files)

Starfleet insignia[]

Rear admiral lower half[]

2350s-2360s 2360s-2370s
service uniform
2360s-2370s
duty uniform
2370s-2380s
RDML 1 (Early TNG)
Red Admiral 1 (Early TNG)
RDML (TNG)
Admiral (TNG)
RDML (DS9-VOY)
Red (VOY)
RDML (DS9-VOY)
Red (DS9)
RDML 2 (Early TNG)
Red Admiral 2 (Early TNG)
RDML 3 (Early TNG)
Red Admiral 3 (Early TNG)
Early 2380s Mid 2380s 2390s

Alternate realities[]

2380s-2400s 2390s 29th century
RDML (alternate 2380s)
Red (alternate 2380s)
RDML (alternate 2390s)
Red (alternate 2390s)
RDML (2800s)
Blue (2800s)

Rear admiral upper half[]

22nd century 2230s
RADM (ENT)
Red Admiral (ENT)
RADM (2230s)
Blue (2230s)
2250s 2260s-2270s Early 2270s
(Shoulders/Sleeves)
Late 2270s-2350s
(Shoulders/Sleeves)
ADM (2250s)
Yellow (2250s)
RADM (TOS)
Yellow (TOS)
RADM Shoulder (TMP)
White Shoulder (TMP)
RADM Shoulder (TWOK)
White Shoulder (TWOK)
RADM Sleeve (TMP)
Green Sleeve (TMP)
RADM Sleeve (TWOK)
White Officer Sleeve (TWOK)
2350s-2360s 2360s-2370s
service uniform
2360s-2370s
duty uniform
2370s-2380s
RADM 1 (Early TNG)
Red Admiral 1 (Early TNG)
RADM (TNG)
Admiral (TNG)
RADM (DS9-VOY)
Red (VOY)
RADM (DS9-VOY)
Red (DS9)
RADM 2 (Early TNG)
Red Admiral 2 (Early TNG)
RADM 3 (Early TNG)
Red Admiral 3 (Early TNG)
Early 2380s Mid 2380s 2390s

Alternate realities[]

2250s 2380s-2400s 2390s 29th century
RADM (STXI)
Admiral (STXI)
RADM (alternate 2380s)
Red (alternate 2380s)
RADM (alternate 2390s)
Red (alternate 2390s)
RADM (2800s)
Blue (2800s)

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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