The U.S. Air Forceโ€™s Advanced Extremely High Frequency protected communications satellite system is now being used by three U.S. allies following the United Kingdomโ€™s successful linkup, AEHF prime contractor Lockheed Martin announced June 10.

The U.K. armed forces connected to the AEHF-2 satellite starting in February using a ground terminal and a terminal designed for ships at sea. By April, the U.K. was participating in U.S.-led AEHF tests that also included Canada and the Netherlands, both of which made their first secure calls through the system in 2013.

The first satellite in the constellation, AEHF-1, was launched in August 2010 but took more than a year to reach its operational orbit due to a propulsion glitch. AEHF-2 joined AEHF-1 in orbit in May 2012. AEHF-3 launched in September.

The satellites, built by Lockheed Martin Space Systems of Sunnyvale, California, are designed to provide assured and highly secure communications links under all conditions, including a nuclear war. One AEHF satellite provides more capacity than the entire legacy Milstar constellation. 

โ€œAEHF not only delivers higher-bandwidth communications for the U.K., it makes communications with allies faster and easier,โ€ Mark Calassa, Lockheed Martinโ€™s vice president of Protected Communication Systems, said in the release.