William M. Jefferies was a Human Starfleet admiral in the 2230s and 2240s. He, along with Captain Robert April, was a key supporter of the development of the Constitution-class of starship. Jefferies supervised the construction of the USS Constitution at the San Francisco Fleet Yards.

In 2244, Jefferies took the Constitution out of drydock and raced to the Donatu system to take part in the Battle of Donatu V. (TOS - Errand of Vengeance novel: Killing Blow)

The insignia pictured would have been worn on a Constitution officer's uniform in the 2250s, it should be noted that uniform configurations slightly different from these examples might have existed in the 2240s.
USS Constitution personnel
USS Constitution (22nd century) La Forge UFP emblem image. Assignment patch image.
USS Constitution (prototype) AugenthalerBanksBartonBorrikCarvajalChafinFerrisJ. GaynorHerzogA. HirotaA. JankowskiW.M. JefferiesJ.T. KirkLidellR. LikinsLivingstoneD. LynchMasefieldL.H. McCoyMedinaG. MitchellParkPolcovichRawitzerRebouletTomberlinC. VelasquezP. WaterstonR. WesleyWootenZuletaunnamed personnel
USS Constitution (Galaxy-class) J. van OsterlichSolackT. SogaB. Spencer
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