MARS member stations meet periodically in scheduled networks on military frequencies outside of the amateur bands.
There are various types of networks and each accomplishes a specific goal. For example, administrative networks to take care of much of the day to day management of the program; traffic networks which exist solely to pass third party traffic; and of course, emergency networks which are established to provide for communications needs during periods of emergency. There are also technical nets and training nets.
MARS nets operate in different modes. Although high frequency (HF) single sideband (SSB) voice is predominant, there are Pactor, MT63, Olivia, PSK31, and even slow scan TV nets.
U.S. Army MARS frequencies are spread throughout the HF band (3-30MHz).