How did they get the Gemini-Rogallo test vehicle airborne? [ Big G Gemini Question]

Thanks to Pat for the Gemini Rogallo references. My questions is: how
did they launch the piloted Gemini-Rogallo test vehicle for its glide
landings? I think a helicopter was used to tow the boilerplate with
attached inflated Rogallo wing, but it would probably take repeated
viewing of some actual footage for me to understand how it was done.
Anyone know the answer?

John Charles
Houston, Texas