Take just one kook(they are out there gentlemen) have them set up a machine gun in the park near the Washington Monument & the field of fire would be the White House, Commerce Building, Treasury Building, Executive Office Building, & the Ellipse.
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The only building that offers a field of return fire is the roof of the FBI Building(J.F. Hoover).
If they were at the Washington Monument I suspect the Secret Service sniper on the roof of the White House would make short work of them in a few seconds. Just saying.
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