55th Infantry Division

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55th Infantry Division
Unit Profile (as of 2765)
Nickname Castor Commandos
Parent Formation XVIII Corps
Formed unknown


The Fifty-fifth Infantry Division was a part of the Star League Defense Force Regular Army.


Prior to the fall of the Star League, the Fifty-fifth was known for the large percentage of its personnel having bionic implants.[1]

In 2764, the unit was assigned, as a part of the XVIII Corps, Seventeenth Army, to the Periphery Military Region, but was moved to an undisclosed area of the Periphery by 2765, as part of the redeployment effort to fight the Periphery Uprising.[2] The Division was destroyed during the Hegemony Campaign.[2]


Rank Name Command
Commanding Officers of the 55th Infantry Division



Composition History[edit]

As an SLDF Infantry division the Fifty-fifth would have been formed from two brigades of grunt infantry and a brigade of light BattleMech regiments.[3]


  1. Field Manual: SLDF, p. 207, "55th Infantry Division"
  2. 2.0 2.1 The Star League, p. 155, "Seventh"
  3. The Star League, p. 133