BOISE, Idaho (AP) - A small computer drive containing Social Security numbers and other personal information about every Army National Guard soldier in Idaho has been stolen, a National Guard spokeswoman said Tuesday.

The device containing information on roughly 3,400 soldiers was stolen Monday night out of a soldier's car while she was traveling in the Treasure Valley on official duty, Lt. Col. Stephanie Dowling said. Officials hope the person who stole the drive - along with other computer equipment and personal items - doesn't know what he has.

Guard members were being notified by phone and mail.

"You name it, it was on there," Dowling said of the so-called thumb drive. "Any time our soldiers' personal data get compromised in any way, it's a big concern for us. We want to make sure that all of our soldiers are informed and protect themselves."

On Tuesday evening the guard activated a phone tree normally used for natural disasters or state emergencies to contact all the soldiers.

Sgt. 1st Class Travis Dryden of Boise was frustrated by the news. He planned to notify credit reporting agencies and take other steps to prevent any damage to his finances.

"It's a matter of how we fail to safeguard our technology assets," Dryden said. "Just a little shocking that that kind of stuff would not be kept under closer, or more immediate, control."