Locking Down the Capitol

Even hosting the largest group of leaders to hit the US since the founding of the U.N., does the nuke weapons summit in D.C. justify calling out the Army?
(edited. 2:40 pm)

(photo 1: Jose Luis Magana/A.P. caption: Army soldiers patrol around the Walter E. Washington Convention Center in Washington, Sunday, April 11, 2010, in preparation for Nuclear Security Summit. photo 2: Gerald Martineau For The Washington Post)