Blast Off was one of the five renegade Decepticons liberated by Starscream in the Air Commander’s latest attempt to unseat Megatron. As an element of their imprisonment, they had been reduced to mere personality components, so Starscream installed them into abandoned World War II military vehicles. The transplant caused the vehicles to immediately reconfigure themselves: Blast Off in particular went from being a B-17 bomber to being a space shuttle, of all things (though he still thought that it was a “crude carcass”). Starscream called them “Combaticons” and announced their names as they transformed
Cybertron form 
Cartoon form
Transformers 