Due to the Privacy Act information on military personnel is limited. However, there are official channels one can go through when trying to contact or get information about a military member or former military member.
For personal records, contact:
National Personnel Records CenterThis organization also holds unit "morning reports" up to 1974 which show daily personnel status of units. However, keep in mind of the Privacy Act. The organization is not obligated to give personal information.
For unit operational records (not personnel) of units up to 1954, contact:
National Archives and Records AdministrationThe National Archives can also be visited through their website at http://www.archives.gov/veterans/.
After 1954, contact:
Freedom of Information Act Office