They launched a SpaceX Falcon Heavy rocket 2:30 am Tuesday with 24 satellites on board. Some of the satellites were DOD, and this mission was a step in getting approval for the Falcon Heavy to launch more serious DOD missions. The two side boosters landed back at Cape Canaveral. The center core was to land on a drone ship but missed it. It nearly had to go into orbit itself in order to get the second stage in orbit with most of its fuel still there. The second stage needed enough fuel to change course several times to distribute the various satellites in their appropriate orbits. This was actually the most difficult mission SpaceX has taken on to date, and they aced it, except for center core recovery. All satellites were delivered successfully.
Edit: One of the 24 satellites was from Georgia Tech.
