Washington ? Two former Army Rangers who were based at Fort Lewis, Wash., pleaded guilty in U.S. District Court in Tacoma on Friday for their roles in an armed bank robbery in August.

Alex Blum, 19, pleaded guilty to one count of conspiracy to commit armed bank robbery and one count of brandishing a firearm.

Scott Byrne, 32, pleaded guilty to one count of conspiracy to commit armed bank robbery.

Byrne is scheduled to be sentenced June 1, and Blum is scheduled to be sentenced June 8.

Four men carrying automatic AK-47s and semiautomatic handguns entered a Bank of America branch at 5:15 p.m. Aug. 7. They stole $54,011 in a heist that investigators said was carried out with “military-style precision and planning.”

Blum, of Colorado, used his own car to drive the group to and from the bank, but he never entered the building.

A witness jotted down his license-plate number, and investigators traced the car to Fort Lewis.