A major project for Boeing (and Northrup Grumman) at this time is the full replacement of the American land-based
ICBM backbone - the Minuteman II. There are at least 450 Minuteman II nuclear silos armed at all times.
I would have to spend more time trying to discover if the Air Force has been given the go-ahead on its 2013 proposal to bore deep underground tunnels connecting the new ICBM missiles. That proposal for an underground subway system, trackless tunnel transport for the entire class of weapons: www.wired.com/2013/03/nuclear-subway/