> I can't find a source, but I have heard from an engineer friend on the inside that originally, Boeing's hubris led them to not engineer a way to unload the hy

> I can't find a source, but I have heard from an engineer friend on the inside that originally, Boeing's hubris led them to not engineer a way to unload the hypergolic propellant once loaded. From what I understand, most of the hypergolic propellant is carried onboard the service module, which was designed and manufactured by L3 Harris (nee Aerojet Rocketdyne). Of course, the responsibility for the entire system still rests with Boeing.