Battlestar Pegasus Schematics

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Following the Cylon attack, along with the elimination of most of the government, Laura Roslin becomes the President of the Twelve Colonies. The ship takes on the call sign Colonial One, and is used to coordinate the collection and organisation of the civilian refugee fleet. After leading the 50,000 survivors to rendezvous with Galactica, which survives the attack, Colonial One becomes the residence and de facto "capitol" of the Fleet government. Although the call sign is based on the real-world United States protocol of referring to any Air Force, Marine Corps, Army, Navy, Coast Guard, or civilian aircraft as, respectively, "Air Force One", "Marine One", "Army One", "Navy One", "Coast Guard One" or "Executive One" when the President is aboard, Colonial One retains this moniker throughout the series, irrespective of the President's presence or absence and is never again referred to as Colonial Heavy 798, apart from during a flashback to before the holocaust; likewise, neither Galactica nor any other vessel adopts the name when the President is aboard.