Elements of the US Department of Defense (DOD) will conduct a “communications interoperability” training exercise November 4-6, once again simulating a “very bad day” scenario. Amateur Radio and MARS organizations will take part. “This exercise will begin with a national massive coronal mass ejection event which will impact the national power grid as well as all forms of traditional communication, including landline telephone, cellphone, satellite, and Internet connectivity,” Army MARS Program Manager Paul English, WD8DBY, explained in an announcement. During the exercise, a designated DOD Headquarters entity will request county-by-county status reports for the 3,143 US counties and county equivalents, in order to gain situational awareness and to determine the extent of impact of the scenario. Army and Air Force MARS organizations will work in conjunction with the Amateur Radio community, primarily on the 60-meter interoperability channels as well as on HF NVIS frequencies and local VHF and UHF, non-Internet linked Amateur Radio repeaters.