Live coverage: Falcon 9 soars into space with DSCOVR

United Launch Alliance teams at Cape Canaveral launched an Atlas 5 rocket at 6:13 a.m. EDT (1013 GMT) Thursday with the U.S. Air Force’s fifth Advanced Extremely High Frequency communications satellite. The AEHF 5 satellite will join a network of geostationary relay stations providing secure, jam-resistant video, voice and data links for the U.S. military.

Investigators believe a leak of propellant inside the Crew Dragon spacecraft’s propulsion system led to the capsule’s explosion April 20 during a ground test at Cape Canaveral, and a senior SpaceX official said Monday that delays are making it “increasingly difficult” to fly astronauts on the commercial spaceship before the end of the year.

A month after an X-37B mini-space shuttle glided to a landing on Kennedy Space Center’s runway in Florida, the U.S. Air Force announced Tuesday that the spaceplane’s next mission will launch in August aboard a SpaceX Falcon 9 rocket for the first time.