- Fighting 47th: Another name for the 47th line.
- Firebase Xeron: Seemingly impregnable Karn World.
- Firepower: The power of a Troops weapons and their skill in using them.
- First Blood: The Intermediate game in the Skirmish rules.
- Form Warriors, Karn: Tough Karn Warriors Psychicly linked to their Family Imperial Battleform.
- Forst: Imperial Karn General of the Klan Scutari, who is chief of security.
- Fortress Bregan: Karn Stronghold on Klammon VI.
- Forty-seventh Line: The most Famous Regiment in the Nexus Rebellion.
- Full Battle: The Final game in the Skirmish Rules.
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