The Advanced Extremely High Frequency system provides a survivable, protected, anti-jam signal for high-priority military communications. As the successor to MILSTAR, the constellation is designed to enable high-level military leaders such as the president, the National Security Council and unified combatant commanders to control strategic and tactical forces, even in the midst of a nuclear war. The sixth and final AEHF satellite was launched in March 2020. Four international partners — Canada, the United Kingdom, the Netherlands and Australia — also use AEHF.
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