but also on a series of rockets dating back to the early days of the space race. Delta II is the ultimate evolution of the US Air Force’s Thor missile, which first flew in 1957 and stood watch ...

hence the vehicle was called the Thor-Delta.) Related: Meet the Delta Rocket Family of the United Launch Alliance Three months later, the Thor-Delta deployed Echo IA into orbit, leading to the ...

Last launch ever for Delta IV Heavy, which'll send classified payload into orbit for National Reconnaissance Office national ...