It was preceded by GEO-1 in 2011 and GEO-2 in 2013. SBIRS GEO Flight-3 was launched in January. “There are no issues with the space vehicle.” Meanwhile, the SBIRS GEO Flight-4 launch has been moved from November to January “due to an updated prioritization of resources across multiple SBIRS mission-enhancement efforts,” the Air Force said. AEHF-5 and AEHF-6 are in production, and the Air Force projects they will be available for launch in fiscal year 2019. It was followed by AEHF-2 in 2012 and AEHF-3 in 2013. “The schedule impact is still under evaluation, but the program office is projecting a launch in calendar year 2018.”ĪEHF satellites are replacing the aging Milstar constellation. “An issue was discovered with a power regulator unit, and the issue requires a modification to ensure the system meets requirements,” the Air Force said.
The AEHF-4 launch has been delayed from October until sometime in 2018 due to a technical glitch with the satellite, the Air Force wrote in a recent response to questions.
ULA is a joint venture of Boeing and Lockheed Martin. The Air Force is pushing back the launches of two Lockheed Martin -built satellites that were supposed to lift off in fall 2017.Įach spacecraft – the fourth Advanced Extremely High Frequency (AEHF-4) protected-communications satellite and the fourth Space Based Infrared System (SBIRS) geosynchronous Earth orbit (GEO Flight-4) missile-warning satellite – is slated to ride on a United Launch Alliance (ULA) Atlas 5 rocket from Cape Canaveral Air Force Station in Florida.
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