I know what you mean (the palace option is a joke) and it's really great to see that you've put in some effort into this design proposal.
However, function and form must work together; what I mean by that is that we cannot start with an external design and then make things work internally. The Army has to first decide what it hopes to accomplish. GHQ is essentially a very large office, and work space design has a major impact on productivity by either encouraging or discouraging interactivity, cross-fertilization of ideas, etc.
Whatever the final design is, it should be:
a.) modern / state-of-the-art
b.) extremely secure (a nuclear power's GHQ should have multiple square miles of denied area surrounding it)
c.) a product of the goals of the organization (i.e. the synergies and efficiencies the Army would like to realize in its new HQ)
My 2 cents...