drone launching pyrotechnics

Earlier this evening at around 8:45PM-9:15PM local time I witnessed some type of drone craft over Redstone Arsenal visible from a neighborhood just Northeast of Gate 10. It had lights and flashers consistent with FAA regulations. The craft slowed to a hover and after a couple minutes it delivered a payload of what seemed to be short-burst comet-type effects that lasted 8-10 seconds with 8 or 9 projectiles that launched out and then back toward the vessel in a circular arc. After the initial display the drone returned back southeast, was presumably reloaded and then delivered the same payload to the same location albeit slightly closer to my location about 10-12 minutes later. I dunno if they are working on some type of pyro display for a corporate retreat or 4th of July celebration, but it was pretty darn cool-looking for the small effect as it was. If a bunch of these were synced up to a timed show and launched closer to the audience radius I could see it h! aving a nice affect in conjunction with a traditional pyro display.