Vanguard Cruisers are normally refitted [[Strike Cruiser]]s rather than purpose-built. They have improved thrusters and defensive turrets, but this comes at the expense of weaker offensive weaponry so Vanguards are less capable in a planetary assault role. As a result, Vanguards are used as scouting vessels operating independently or as heavy escorts as part of a large Space Marine fleet.{{Fn|2}}{{Fn|3}}