Kenv
With apologies:
You mention six completely separate pieces of work which needed to be seamlessly integrated with all the associated functionality, redundancy, recovery, and hardening.
That's beginning to sound more like a 25-30% modification across the piece. If so then that represents quite a significant amount of effort in terms of project duration and the potential for delay.
Even if, as they should have been, all the bases had been covered during the design process, do you believe that the project still had the potential to be successful (Within the definition of success) for the USAF?
If not, is there a fallback position which will allow face saving on both sides?
Imagegear