Twelve Star Command Fleets

Star Command Fleet is split into twelve fleets that allow the starships and personnel of the Fleet to complete the requirements of their duty.
The fleets are named by numbers, but each is given a colour. The commanding officer of each is known as the "admiral of" the colour of the fleet. (e.g. The Admiral of the Red s the CO of the Fourth Fleet.)
The fleets numbers, colours and where they are assigned is listed below:
First Fleet - Blue - Core Worlds
Second Fleet - Gold - Core Worlds
Third Fleet - Purple - Core Worlds 
Fourth Fleet - Red - First Frontier 
Fifth Fleet - Orange - Second Frontier 
Sixth Fleet - Yellow - Core Frontier 
Seventh Fleet - Green - Outer Core 
Eighth Fleet - White - Frontier Rim
Ninth Fleet - Brown - Outer Rim
Tenth Fleet - Grey - As Required
Eleventh Fleet - Pink - As Required
Twelfth Fleet - Black - As Required