All that is publicly known about the Zuma payload is that it is a satellite manufactured for the United States government by Northrop Grumman, and it is bound for low-Earth orbit.
After a almost two-month delay, the rocket is set to blast off sometime during a two-hour launch window, which opens at 8 p.m.
SpaceX is scheduled to launch an undisclosed national security payload on Sunday night. So it's certainly not unlikely that it's designed for military or intelligence purposes; per USA Today, amateur satellite watchers have speculated Zuma is related to earlier launches of spacecraft that appeared to be surveilling other spaceborne objects.
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The police are investigating if it is a case of drunken driving since some liquor bottles were found in the vehicle. The injured players include powerlifting world champion Saksham Yadav and another player identified as Bali.
The current weather forecast predicts an 80 percent chance of favorable launch conditions.
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 yesterday blasted off a secretive U.S. government payload known as Zuma, a mission whose nature - and the agency behind it - remains a mystery. SpaceX has done classified launches for the Air Force and National Reconnaissance Office before, but this is the first time that the name of the government agency behind the spacecraft being launched is not even known.
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Hypothermia is also a serious risk; anyone outside is advised to dress as warmly as possible, says the Weather Service. A Wind Chill Advisory means that cold air and the wind will combine to create low wind chills.
The launch is SpaceX's first in what is expected to be a busy year.
"As a company, Northrop Grumman realises this is a monumental responsibility and we have taken great care to ensure the most affordable and lowest risk scenario for Zuma", Mr Rains said, declining to comment on the nature of the payload.
Launch attempt of SpaceX Zuma mission.
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Aerospace and defense company Northrop Grumman was responsible for securing SpaceX's launch services for the Zuma mission.