HELENA, Mont. (AP) -- Federal homeland security officials say Montana residents won't be allowed to use their driver's licenses to access military bases, power plants and federal facilities starting Jan. 30.

And unless the state commits to meeting the requirements of driver's license rules under the federal Real ID Act, its residents will need another form of identification to board commercial aircraft in 2018.

Alain Bersin and Philip McNamara of the Department of Homeland Security sent Gov. Steve Bullock a letter Tuesday rejecting the governor's request to delay implementation of the 2005 federal law.

The law was passed to prevent terrorism and identity theft.

The state Legislature voted in 2007 not to comply with the federal law over concerns of federal overreach and that personal information could be breached.

Bullock and Attorney General Tim Fox say Montana licenses are secure.