Shockwave hailed from the city of Tarn.
Tarn and Vos were city-states with a history of rivalry. During the Golden Age, some attempts at pacifying the states were made by making Tarn the location of the annual State Games. During the civil war, Tarn surrendered to the Decepticons with minimal resistance, offering to root out Autobot sympathizers. Seeking to create a model Decepticon city, Megatron appointed Shockwave governor. He requested the Vos Air Commander missile-strike Tarn, using this as an opportunity to quell dissent by blaming the attack on the Iaconian Autobots.