Hi Yes, "roll-out" means that a piece of technology can be displayed to - and / or used by - the public - Now we have fully tested the new software, we can roll it out [= make it available to people] A pad is a piece of ground that is used to launch missiles and rockets. They are often given a short coded name. "OA" appears to be the code for the main site at Wallops Island, Virginia And I believe it looks like this ...
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