Live coverage: Atlas 5 countdown and launch journal

A highly sophisticated U.S. Air Force satellite to sound the alarm when an enemy missile launches has shipped to its Florida launch site for liftoff in October aboard a United Launch Alliance Atlas 5 rocket.

SpaceX launched its fifth Falcon 9 rocket in 22 days on Saturday, beginning a mission to deploy 52 more Starlink internet satellites and two rideshare payloads for Capella Space and Tyvak Nano-Satellite Systems. Liftoff from pad 39A at NASA’s Kennedy Space Center in Florida occurred at 6:56 p.m. EDT (2256 GMT), and SpaceX successfully landed the first stage on a drone ship in the Atlantic Ocean.

The United Launch Alliance Atlas 5 rocket was transfered from its assembly building to the pad at Cape Canaveral’s Complex 41 today for Thursday’s launch of the U.S. military’s third SBIRS GEO missile warning satellite.