The Department of Defense will host this year’s Armed Forces Day (AFD) Crossband Test. For more than 50 years, military and amateur stations have taken part in this event, which is an interoperability exercise between hobbyist and government radio stations. The AFD Crossband Test, open to all licensed amateur radio operators, is a unique opportunity to test two-way communication between military communicators and radio stations in the Amateur Radio Service (ARS). These tests provide opportunities and challenges for radio operators to demonstrate individual technical skills in a tightly controlled exercise scenario that does not impact any public or private communications. Military stations will transmit on selected military frequencies and will announce the specific ARS frequencies monitored. All times are ZULU (Z), and all frequencies are Upper Side Band (USB) unless otherwise noted.
See attached document or this link for more details = https://www.dodmars.org/mars-comex-information-website/armed-forces-day?utm_source=chatgpt.com