 Normal insignia included arm bands for Observers and Chief Observers and the rare AWC patch for filter center workers.On the east coast, to coordinate the interest of the volunteers and to provide a medium for important news and training information, the "Observation Post," a semi-monthly publication of the Ground Observer Corps, was started in March 1942.This four page black and white newsletter gave way to a full-fledged monthly magazine, "Aircraft Warning Volunteer" in June 1943.