Montana Military Records
From Ancestry.com Wiki
This entry was originally written by Dwight Radford for Red Book: American State, County, and Town Sources.
Many original military records for the state of Montana are on file at the Montana Historical Society archives in Helena. These include the Spanish American War, World War I and World War II, records and early National Guard enlistment records. These records are filed on 60,000 cards arranged alphabetically by surname. The information on these cards includes name, service number, place of enlistment and date, age at entrance, rate, home address, service record history, remarks, and discharge information.
The Montana GenWeb Project website includes indexes for soldiers in the Spanish American War and the 1940 Montana National Guard. Additional sources are continually added.