The State, War, and Navy Building, as it was originally known, housed the three Executive Branch Departments most intimately associated with formulating and conducting the nation's foreign policy.
As we start building these things, people are going to look at the departments that are implementing their SOA projects and try to figure out how to bind these things at an enterprise level.
After building their third data mart, most departments recognize the need to standardize definitions, rules, and dimensions to avoid an integration nightmare down the road.