If Tsien hadn't been deported from the US in the '50s, how much would development of Chinese rocket technology be delayed or slowed? From what I can gather, Tsien's experience at the JPL and his detailed investigation of the V-2 rocket program immediately after the Second World War pretty much put him leaps and bounds ahead of any other Chinese scientist available to the PRC during the first few decades of the Cold War. Would the absence of this single individual be enough to force the Chinese to rely on more Soviet expertise in regards to missile technology, thus stifling the early development of a domestic rocketry program?