Under the terms of the $4.3m extension, Boeing will continue to provide specialised software operations and maintenance support to military intelligence customers.
M3 provides military and intelligence customers to information-sharing across intelligence agencies and departments.
The capability also helps create, send and receive messages from a variety of sources, real-time distribution of messages, quick delivery of high-priority traffic, and segregation of special message types.
Boeing Mission Systems director Dewey Houck said M3 allowed for additional levels of access controls to ensure that there was no possibility of unintended disclosure to unauthorised users.
The M3 contract began under the army in 2009, after transferring from the Defense Intelligence Agency.