Generally, CFARS was designed to improve the radio communications service provided over the years on the amateur frequencies by:
a. being an adjunct to existing military radio facilities, thus providing an extra means of communication when necessary;
b. eliminating a recurring problem of interference, mainly caused by increasing congestion of the amateur bands - the main cause of delays in handling of phone patches and message traffic; and
c. ensuring that military amateur stations in isolated or remote locations would not be shut down because licensed radio amateurs were not available to operate such stations.
History of CFARS (PDF)