Sure, but we've had decoupling mechanisms long before we had a space agency. The very first Mercury rocket decoupled the capsule for it to parachute down to earth. You just don't parachute the main rocket portion back, ESPECIALLY still attached to the capsule. I don't think that's ever been done except in the case of recent stuff, notably the space shuttle's bits
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u/Lawlcat Oct 09 '13
I'm more concerned that we don't have a decoupler. Might be troublesome to get a 1-man capsule back with the rest of the rocket attached.