The claim: US Force Command - Multiple reports that this will be the national headquarters and coordinating center for foreign/UN troop movement and detainee collection.
What it really is: Ft. McPherson was a very old army base. In fact several buildings there are now on the National Register of Historic Places.
Opened in 1885, it continued operating until it was finally closed on September 15, 2011, and is now going to be used for public use. In fact 150 acres are going to be converted into green space for a park, and several housing are actually going to be used for low income housing, and even housing for the homeless.
There are several other things I could go into about what the fort is going to used for, but what I can tell you what it will not be used for is a command for the UN.