Troops will set traps and assist local hunters but won't use firearms. Over 100 people have been injured and at least 12 killed in attacks since April.
Justices were skeptical Monday that the case was an exception to other lawsuits against defense contractors, which usually get immunity in such litigation.
VA continues to award contracts for pricey, "high-tech" weapons detection systems that the FTC and security specialists argue don't perform as advertised.