SpaceX launched Zuma from its SLC-40 launch facility at Cape Canaveral in Florida, which was used instead of its other launch facility at Cape Canaveral because that was being employed for preparations for the launch of SpaceX’s Falcon Heavy rocket.
The payload will be delivered to low Earth orbit, per the mission parameters, but we don’t know anything else about its purpose, design, or intended mission, because it’s all classified.
SpaceX has also flown other sensitive cargo for the U.S., including the Air Force’s X-37B spaceplane.
This launch also included a recovery of the first stage booster used with the Falcon 9, which returned to Cape Canaveral and landed at its LZ-1 landing pad after deploying and separating from the second stage.
SpaceX now can look forward to its next major test for the year – launching its huge heavy-duty rocket for the first time ever.