Yesterday, I posted about the AJ-260 solid rocket motor and it's abandoned test facility in Florida's everglades. I noted I found it on TRF but didn't provide a link. The discussion has continued and I'll point you to a specific post by luke strawwalker. His posts provide a lot of info but tend to be long, so I haven't waded through his post and associated links. Your milage may vary.
Member bigone5500 shared a photo of one of the static tests:
Before I read the caption, I assumed the thing flying away in the upper left corner was the ignition motor, which itself was ejected and was tethered to keep it from reaching orbit. (Just kidding, it was to keep if from landing in Miami. LOL)