SICON
- Commander Marlow
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- Voice actor: Thomas Wagner
- Commanding officer of the Valley Forge, the starship to which Alpha Squad is initially assigned. Old-school fleet officer who was looking forward to retirement before the Bug War began.
- General Miriam Redwing
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- Voice actor: Irene Bedard
- Former flame of Lt. Jean Razak, and friend of Sgt. Charlie Zim; now a General at SICON Headquarters. A compassionate yet stern career officer.
- Sky Marshal Sanchez
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- Voice actor: R. Lee Ermey
- Top military brass of the SICON Forces. Has demonstrated a willingness to sacrifice civilian lives if he believes it will help achieve victory. Note that the Sky Marshal in the novel was female, unusual for a 1950s SF novel.
- Lieutenant Earl Walker
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- Voice actor: Michael Harrington
- Intelligence officer who has an uneasy relationship with Razak and the Roughnecks. Seems to value intelligence data more than the human beings under his command who have to collect it. At one point, Walker was willing to ensure that Razak's military career would end during General Miriam Redwing's supposed disappearance being unaware of Redwing and Razak's sting operation against a mole within the SICON ranks. During the Homefront campaign, Walker and Razak along with their squads managed to put aside their differences and befriended each other. Walker is not seen after Razak's death except for taking command of his squad fighting elsewhere during the conflict.
- C.H.A.S. (Cybernetic Humanoid Assault System)
- A prototype combat robot with state-of-the-art weaponry, armor and AI. CHAS joined the Roughnecks for a single mission during the Tophet Campaign, at the end of which he sacrificed himself to save Higgins and the rest of the squad. Audio commentary by the production crew has stated that the C.H.A.S. units cost a lot of production resources. Although they do appear later as bridge guards and combat but are easily dispatched by the Zander bug.
Read more about this topic: List Of Starship Troopers Characters, Roughnecks: Starship Troopers Chronicles