Photos: News media images of Atlas 5 launch

The first launch of a U.S. Space Force mission since the establishment of the new military service is planned Thursday, when a United Launch Alliance Atlas 5 rocket is set for liftoff from Cape Canaveral with a billion-dollar jam-resistant communications satellite designed to ensure national leaders remain connected with the armed forces.

After an exhaustive investigation, SpaceX engineers have identified the most likely cause of the spectacular explosion of a Falcon 9 rocket during a pre-launch test Sept. 1 that destroyed the booster and its $195 million satellite payload, the company announced Monday.

Eight miniature weather observatories, each the size of a piece of carry-on luggage, were installed on a specially-designed deployer module and mounted on the front end of an air-launched Pegasus XL rocket to prepare for Monday’s flight into orbit.