Federal military records from the Revolutionary War to 1912 are available at the National Archives:
National Archives and Records Administration
Military records from World War I to the present are held at the National Military Personnel Records Center:
National Personnel Records Center
Indiana Territorial Militia records, Indiana State Militia records, and various state-related military records are held by the Indiana State Archives:
Indiana State Archives
Many of these records are available online through the Indiana Digital Archives
LaPorte County Enlistment Records of Soldiers, 1919-1932 - Includes surname index. Three microfilm readers are available for free public use in the Reference Department. Please ask at the Reference Desk if you have any questions. Copies are $0.15 a page.
LaPorte County Soldier's Discharge Records, 1865-1898 - Contains a record of honorable discharges from U.S. military service, showing dates of enlistment, discharge, and recording; name, age, rank, color, address, and service record of veterans; physical condition when discharged; marital status; etc.
Three microfilm readers are available for free public use in the Reference Department. Please ask at the Reference Desk if you have any questions. Copies are $0.15 a page.
Genealogy Research in Military Records - A short guide from the National Archives
Ancestry Library Edition - Available within the library
HeritageQuest - Log in at home with your library card number
Indiana Digital Archives - Early military records
LaPorte County, Indiana Veterans - LaPorte County INGenWeb
Military Personnel - National Archives
Casualty Lists - National Archives