SpaceX scrubbed a planned Sunday morning launch of a payload for the U.S. National Reconnaissance Office.
The spy satellite, known as NROL-76, was to have been launched from Kennedy Space Center in Florida.
The four-hour window for a launch Monday starts at 7 a.m. EDT.
If the launch Monday goes as planned, SpaceX will attempt to land the first-stage booster back at Cape Canaveral Air Force Station.
The Hawthorne, Calif., space company last month relaunched a previously used first stage to put a commercial communications satellite into orbit, and then landed the booster on a floating sea platform. Monday's payload would be launched atop a new first-stage booster.
Few details have been released about the rocket's payload. Unlike with commercial launches, SpaceX did not say how long it would take the satellite to deploy or to what orbit it would travel.
This may not be SpaceX's first launch for the NRO, which is part of the Defence Department. The company is believed to have launched a small satellite for the intelligence agency as a secondary payload during a December 2010 demonstration flight for NASA. SpaceX and the NRO did not respond to requests for comment about that launch's payload.
Since being certified in 2015 to launch national security satellites, SpaceX has won two contracts to launch GPS satellites for the U.S. Air Force. That has put pressure on United Launch Alliance, a joint venture of Boeing Co. and Lockheed Martin Corp. that has long held a lucrative monopoly on sensitive military launches.
