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The Military Auxiliary Radio System (MARS) has announced dates in 2021 during which MARS members will operate on 60 meters for interoperability with the amateur radio community. Some dates coincide with quarterly Department of Defense Communications Exercises (COMEX).
All exercises will begin on channel 1 as the initial calling channel and move to other 60-meter working channels as may be appropriate.
Additional information can be found at:
MARS Announces Schedule of Dates for 60-Meter Interoperability