SpaceX announced in an official statement that it scheduled the launch of a Falcon 9 rocket carrying 21 Starlink satellites into low Earth orbit for December 28.
The statement also said that Falcon Heavy will put the USSF-52 into orbit no earlier than on the date aforementioned.
The launch of the Falcon 9 rocket was originally scheduled to occur on December 16, from California's Vandenberg Space Force Base.