I'm all for Homeland Security, but something is seriously out of whack if the Pentagon is spying on the Quakers.
Just because they're Quakers doesn't mean they can't be misled and used for subversive purposes. A lot of otherwise harmless groups got infiltrated by Commies, then subverted and redirected during the Viet Nam years.
In a time of war, especially when there is a very real threat of domestic terrorism, the military is wise to monitor all of these groups. If for no other reason than to assure that they are not risks.