At work, I was privileged enough to be exposed to a little piece of history that I was unaware of; The use of drones in the Vietnam War.
Turns out, that we had a program utilizing drones to gather ELINT on SA-2 SAM systems utilizing a DC-130 with drones in concert with a modified B-47 designated RB-47.
So the DC-130's apparently launched the drones to try and get SA-2 sites to paint them with their radar and engage, so that the RB-47 could gather whatever ELINT data possible on the new anti-air system.
Really neat stuff. If you're interested there's a book called, The History of Strategic Drone Operations that mentions it a little bit.
Most of the RB-47 sorties were flown out of Bien Hoa airbase in south Vietnam.
Also check this link out. Really cool shit.
http://www.coldwar.org/text_files/rb47_rc135.pdf