The Brood War revealed critical weaknesses in terran anti-air capability. The new Wraith [...] combat fighters and Valkyrie [...] missile frigates proved to be an unwieldy combination against agile zerg airborne organisms. Ground-based anti-air support from goliath [...] assault walkers was too limited in its mobility: all too often airborne attackers would simply move out of the goliath's range and find less well-defended targets to destroy. In the aftermath of the war, terran weapon technicians proposed a radical new concept to resolve both of these problems. Based heavily on the transformation design of the terran siege tank [...], the viking was designed to be the ultimate anti-air and ground-support weapon system. With the ability to change its combat role from an assault walker to an air-superiority fighter, the viking can switch smoothly to fulfill tactical needs in a developing battle. It can fly into the enemy base and transform to ground-mode to evade anti-air fire. Or it can effectively pursue air hostiles while defending base. Unfortunatelly there are few pilots, who can control both modes properly. In ground mode Viking uses two triple barrel gatling cannons [...]. Against air targets is Viking equipped with two six-tube missile launchers [...] [1].