War Emergency Radio Service
When the United States entered the Second World War, the United States Congress had suspended all amateur radio activity throughout the country. WERS was established by the Federal Communications Commission in June 1942 at the insistence of the American Radio Relay League. WERS was to provide communications in connection with air raid protection, and communications during natural disasters. WERS licenses were given to communities, not to individuals; one of the requirements for individuals to participate in the WERS was to hold an Amateur radio license.
WERS was authorized to operate on the following bands.
Band name Frequencies Notes 2½ meters 112–116 MHz Sixteen channels at 200 kHz spacing. Subset of current aircraft band 1¼ meters 219–225 MHz Nearly identical to current 1.25 meter amateur band 70 cm band 400-401 MHz Now allocated to Earth-orbiting satellite operations
Frequencies were required to be stable to within 0.1%; tighter frequency control would have required use of quartz crystals, which were in high demand at the time for military radio purposes. The intention of the service was for communications up to about 10 miles, so power was restricted to 25 watts. The Office of Civilian Defense recommended home-built equipment, using salvaged components from civilian receivers, so as not to require critical items not readily available during the war. 
- Amateur Radio Emergency Service
- Amateur radio emergency communications
- Amateur radio operator
- Amateur radio station
- "A Nonagenarian's Ham Shack". American Radio Relay League.
- Herman, Jeffrey. "War Emergency Radio Service (WERS)". BOATANCHORS archives.
- Campbell, Douglas E. (2016). Continuity of Government: How the U.S. government functions after all hell breaks loose. Lulu.com. p. 16. ISBN 978-1365614422.[self-published source]
- "The History of Amateur Radio". Ham-Shack archives.
-  The War Emergency Radio Service: Civilian Defense Stations: Volume 3040 of OCD publication 3040, United States Office of Civilian Defense, 1943