Here, on Wikipedia is an article on Manhattan Project: http://en.wikipedia.org/wiki/Manhattan_project
There is a Manhattan Project organization chart marked as Public Domain from May 1946, from U.S. Army:
I belive, this could make an entire new gameplay, with objectives holding Commanding General + Commites + OCE (safety)
My idea is that Manhattan district staff (there are exactly 8 - Administrative, Independent, Security... ) be the starting points of players... All "head of department" connecto the lower instances of "FIELD offices"
Exactly this structure could work for a map I belive. Only graphics missing
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