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Under the 2020 NSSL Phase 2 awards, ULA won 60 percent of the missions and SpaceX won 40 percent of the missions.
On 2023-06-08, the U.S. Space Force launch procurement office assigned an additional 12 missions to SpaceX and United Launch Alliance under the National Security Space Launch Phase 2 contract.
The SDA Tranche 1 Tracking Layer launches will use United Launch Alliance’s Vulcan and SpaceX Falcon 9 rockets from the Western range into polar orbit.
United Launch Alliance successfully conducted a booster engine flight readiness firing on 2023-06-07 at Space Launch Complex-41 at Cape Canaveral Space Force Station, Florida.
United Launch Alliance planned to carry out the Flight Readiness Firing on 2023-05-25 but called off the test several hours in advance after detecting a delayed response in the booster ignition system.
United Launch Alliance must coordinate the Cert-1 launch schedule around other Atlas launches at the pad.
During the countdown on 2023-05-25, ULA's team observed a delayed response from the Vulcan booster engine ignition system that requires further review.
Before the Centaur test anomaly, United Launch Alliance had been working toward a 2023-05-04 launch window for the Cert-1 mission that was about four days long.
United Launch Alliance rolled the Vulcan Centaur rocket from Space Launch Complex 41 at Cape Canaveral back to its Vertical Integration Facility on 2023-05-15.
Astrobotic’s Peregrine lander was scheduled to launch in May 2023 on the first Vulcan Centaur but United Launch Alliance delayed that launch because of an anomaly during testing of a Centaur upper stage in March 2023.
United Launch Alliance plans to resume tanking tests of its Vulcan Centaur rocket as early as next week from 2023-05-11.
United Launch Alliance has not provided a new target launch date for Vulcan as of 2023-05-11.
United Launch Alliance plans to test fire Vulcan Centaur’s main engines as early as next week from 2023-05-11.
The second ViaSat-3 satellite was undergoing final integration and tests at Boeing’s facilities ahead of a planned Atlas V launch by United Launch Alliance in fall 2023.
The U.S. Space Force Space Systems Command stated that USSF-106 launch dates and impacts from the Centaur 5 test anomaly are under review pending the ULA investigation.
NTS-3 is scheduled to launch as a 1,250-kilogram secondary payload on USSF-106, a national security space mission assigned to United Launch Alliance’s Vulcan Centaur rocket.
Northrop Grumman planned in 2019 to use SLC-6 to launch its Omega solid rocket for the National Security Space Launch Phase 2 competition and later discontinued the program after losing NSSL Phase 2 contracts to ULA and SpaceX.
SLC-6 was reactivated in the 1990s for a handful of Lockheed Martin Athena launches and was turned over to United Launch Alliance in 2006 for the Delta 4 program.
United Launch Alliance had announced a 2023-05-04 target date for Vulcan’s first launch prior to the 2023-03-29 incident.
The NRO-built SilentBarker satellite is scheduled to launch later 2023 on a United Launch Alliance Atlas V rocket.