[rdmckenzie]

Arguably, but the D-21 drone [1] was... a mess & a failure. Line Of Sight radio control was the only real option.

[1] http://en.wikipedia.org/wiki/Lockheed_D-21

[ceejayoz]

I'm confused. The D-21 wasn't nuclear, and we've clearly fixed the problems with drones they had during that program. What's your point?

[wtracy]

Unmanned aircraft were impractical during the Cold War, which is the only point in history when nuclear-powered aircraft were seriously considered. Drones are workable now, but political considerations alone make nuclear aircraft a non-starter today.