A point of contention for the fans of Battlestar Galactica (show and game) is the size of the Colonial Fleet. The only real on-screen information is a line in the miniseries in which the crew gets news of the loss of 30 battlestars in the initial engagement and Starbuck says “That a quarter of the fleet…” Since the word used is fleet — I’m going with the idea that “battlestar”, like ship, is a general term that might cover battlestars we’ve seen down to various escorts, etc.
The fleet appears based on the US Navy, so that is on what I’m basing my take on the Colonial Feet.
Based on Picon, the Colonial Fleet nevertheless has local headquarters on each colony. (The show seems to suggest Delphi or Caprica City was the regional/colonial base of operations.) There is a military academy mentioned, and I think we can assume it’s on Picon, where the main HQ for the fleet is located.
The fleet itself is approximately 120-150 ships strong, divided into a collection of operational “battlestar groups” or BSGs. There are twelve fleets tasked with the protection of a specific colony, with three Colonial Marine Corps Assault Groups (MAG) [these would be the equivalent of marine expeditionary fleets in the US Navy.] There is also an exploration group, tasked with exploration and mapping of the surrounding star systems, and espionage/early warning activities. There are also some vessels on detached duty, conducting rescue of civilian vessels, criminal investigations, etc.
The average BSG is comprised of 6-10 vessels. The main asset is the battlestar, a heavy battleship/aircraft carrier, with four escort vessels (alternately called gunstars or assaultstars in fandom.) The gunstars are dedicated platforms which provide missile and fighter defense for the battlestar and are positioned far enough away from the primary to give early warning and defensive cover. Assaultstars are Colonial Marine transport platforms which allow the BSG to project force on the ground, or conduct boarding actions. Most BSG have one or two in their group. Lastly, there is often a tender and/or fueler with a battlestar group, providing supplies to the other vessels.
MAGs are smaller, comprised of one or two assaultstars with marine complements and equipment for fast response to crises around the Twelve Colonies. These assaultstars are accompanied by a pair of gunstars, a tender, and a fueling vessels. The average marine complement on an assaultstar is anywhere from a company to a battalion of marines, and their ground equipment. These vessels are more cramped than battlestars, and usually have short “float” durations (a few months, at most.)
The exploration group is broken into small expeditionary groups, usually involving an older battlestar or assaultstar, a civilian science vessel, and a civilian tender/fueler — with the civilians being on military contract and subject to military command and jurisprudence. Their missions range from a few weeks to six months. (Here’s a good hook for a “second fleet” campaign.)
With spaceborne assets, ground assets, the CMC I would estimate the total manpower of the Colonial fleet is about a million men and women under arms.
The fleet was created during the First Cylon War, and incorporated military assets from all Twelve Colonies. It is understandable that there would be vestiges of these older military units — planetary guard (National Guard units, if you will) that are colony-specific and handle most humanitarian aid, peacekeeping, and other non-kinetic operations. I would assume they could be rolled into Colonial command during a time of war.




