The Alliance Short Range Enforcement Vessel (ASREV) was a heavily armed Alliance vessel slightly bigger than the shuttles. One of these vessels was used by Womack and his crew, to pursue Serenity, and was armed with several missiles and magnetic depth charges. ASREVs were the most common vessels used by Federal marshals, though in addition to their law-and-order quick response role ASREVs were also principally used for airspace superiority missions over planetary settlements and conducting anti-boat/anti-missile patrols for Alliance of Nations bases and warships. Though equipped with a Pulse Drive the vessel's slow speed and cramped interior made it ill-suited for long-range courier or pursuit missions. They were used by the Allies and Axis

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