The US Department of Defense (DOD) is hosting this year's Armed Forces Day (AFD) Crossband Test on Saturday, May 11.
For more than 50 years, military and amateur stations have taken part in this event, which is an interoperability exercise between amateur and government radio stations. The event is open to all licensed amateur radio operators and will not impact any public or private communications.
The AFD Crossband Test is a unique opportunity to test two-way communications between military communicators and radio stations in the Amateur Radio Service (ARS), as authorized in 47 CFR 97.111.
For more details:
https://www.dodmars.org/mars-comex-information-website/armed-forces-day
https://www.arrl.org/news/armed-forces-day-crossband-test-scheduled-for-may-11