Thanks Oorang.

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Canada, U.S. agree to use each other's troops in civil emergencies
Friday, February 22, 2008
Canada and the U.S. have signed an agreement that paves the way for the militaries from either nation to send troops across each other's borders during an emergency, but some are questioning why the Harper government has kept silent on the deal.
Neither the Canadian government nor the Canadian Forces announced the new agreement, which was signed Feb. 14 in Texas. The U.S. military's Northern Command, however, publicized the agreement with a statement outlining how its top officer, Gen. Gene Renuart, and Canadian Lt.-Gen. Marc Dumais, head of Canada Command, signed the plan, which allows the military from one nation to support the armed forces of the other nation during a civil emergency.
The new agreement has been greeted with suspicion by the left wing in Canada and the right wing in the U.S. The left-leaning Council of Canadians, which is campaigning against what it calls the increasing integration of the U.S. and Canadian militaries, is raising concerns about the deal.
SNIPPET:
On right-wing blogs in the U.S. it is being used as evidence of a plan for a "North American union" where foreign troops, not bound by U.S. laws, could be used by the American federal government to override local authorities.
"Co-operative militaries on Home Soil!" notes one website. "The next time your town has a 'national emergency,' don't be surprised if Canadian soldiers respond. And remember - Canadian military aren't bound by posse comitatus."
Excerpted
http://www.canada.com/components/print.aspx?id=403d90d6-7a61-41ac-8cef-902a1d14879d&k=14984