Advanced Extremely High Frequency (AEHF) is a constellation of communications satellites operated by the United States Space Force. They are used to relay secure communications for the United States Armed Forces, the British Armed Forces, the Canadian Armed Forces, the Netherlands Armed Forces and the Australian Defence Force.[3] The system consists of six satellites in geostationary orbits. The final satellite was launched on 26 March 2020. AEHF is backward compatible with, and replaces, the older Milstar system and will operate at 44 GHz uplink (extremely high frequency (EHF) band) and 20 GHz downlink (super high frequency (SHF) band).[4] The AEHF system is a joint service communications system that provides survivable, global, secure, protected, and jam-resistant communications for high-priority military ground, sea and air assets.
^"AEHF Achieves Initial Operational Capability". Los Angeles Air Force Base. 30 July 2015. Retrieved 4 January 2018. This article incorporates text from this source, which is in the public domain.
^"Two U.S. military satellite launches delayed into next year". Spaceflight Now. 2 August 2017. Retrieved 4 January 2018.
^"AEHF-5 Ready for Launch". Los Angeles Air Force Base. Retrieved 12 August 2019.
^"Northrop Grumman AEHF". Retrieved 15 June 2011.
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