|Inner Sphere Military Ranks|
|For specific ranks see Military Ranks|
Field Marshal is the highest rank of the AFFS. The AFFS Marshal of the Armies and Prince's Champion are not ranks a soldier can earn, but a position they occupy in the command structure. Holders of those positions do typically hold the rank of Field Marshal.
There are at least fourteen Field Marshals in the Federated Suns: Three for the Capellan and Draconis Marches (total six), four for the Crucis March (total ten), and five who advise the Prince but hold no specific command. 
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During the Federated Commonwealth's existence, the number of Field Marshals dropped considerably. Instead of commanding a region of space, Field Marshals in the AFFC commanded either a State Command (Federated Suns/Lyran Commonwealth) or a major administrative/noncombat command like the Department of the Quartermaster, Department of Strategy and Tactics, or the Department of Military Intelligence.
- House Davion (The Federated Suns), p. 130
- 20 Year Update, p. 16