The HFGCS, or High Frequency Global Communications System, is one of the Pentagon’s most sensitive channels. It has existed since the Cold War as a backup system to send Emergency Action Messages (EAMs) to strategic aircraft and submarines anywhere on the planet, including, in the worst-case scenario, a nuclear launch order.

The message picked up by amateur radio operators is clear in form. “BRADFIELD 6 C W C H 7 6 C W C H 7 F 7 T G F S U U J F 2 T G F S.” It is an EAM, a string of letters and numbers intentionally unintelligible to anyone who does not hold the matching key. The network is operated from Andrews Air Force Base in Maryland, and call signs like “BRADFIELD” identify the transmitter.

These messages are part of military routine. HFGCS broadcasts them every day, several times a day, on frequencies such as 11.175 MHz. Most are drills, authentications or low-level instructions. The difference is that when frequency rises or the pattern changes, military analysts and civilian monitors turn on alarms: it would suggest a spike in strategic activity.

The context turns any catch into news. The United States is running open operations in the Strait of Hormuz, maintains a war with Iran under a fragile ceasefire, faces a crisis with European allies over the stance on the conflict, and new tensions with Canada after Ottawa’s pivot toward China. Every EAM, in this scenario, is examined under a magnifying glass.