Defense Secretary Ashton Carter and other top brass will present the awards at a special Pentagon ceremony on Thursday at 2:00 pm (1800 GMT.)
Airman 1st Class Spencer Stone, 23, will receive the Airman's Medal, which is given to Air Force members who distinguish themselves by heroic actions.
Similarly, Army National Guard Specialist Alek Skarlatos, 22, will receive the Soldier's Medal; and Anthony Sadler, who is 23 and not in the military, will receive a civilian award called the Secretary of Defense Medal for Valor.
Additionally, Stone will receive a Purple Heart medal, which is normally given to troops who are wounded in combat, the Air Force Times reported. Stone suffered hand and eye injuries in the August 21 incident.
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The trio, who are from California and have been friends since school, have already been awarded France's Legion of Honor, the country's highest decoration, for their role in subduing the gunman on a packed train headed from Amsterdam to Paris.
He was overpowered by the three Americans, with the help of British and French passengers.