Yes - if you have a Veteran's service #, you can request a copy of their military records via the National Archives' eVetRecs site. It depends on whether or not you're a relative , Veteran, or researcher as to which request form to use, but the site is pretty good on how to request records and the procedure for doing it. The forms and request process are online - the link is below.
Veterans and next-of-kin can obtain full records - the general public is afforded only limited information.
Your army service certificate number can typically be found on your military discharge paperwork, such as your DD Form 214. If you no longer have this document, you can request a copy from the National Archives or your respective military branch's records department.
When soldiers first started receiving service numbers, there was a special number only the military used. In the modern military, your "service number" is your Social Security number.
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Start by checking any military records or documents your family might have. You can also reach out to the National Archives or the appropriate branch of the military for service records. Additionally, consider asking other family members or researching unit histories to see if you can identify which unit your grandfather served in.
The service number is located on the first line of the DD-214, in a block titled: :Service Number"
Yes. Yes they can. Such records as previous criminal convictions, or dishonorable indebtedness can prevent enlistment.
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Go to the US Archives. If you go to the .gov website for the US Archives, you will find a link to military records. You can fill out a form online, and if it is available they will send you the records for a small fee for copying charges.
You can get free copies through this site http://www.archives.gov/veterans/military-service-records/get-service-records.html
The American military introduced service numbers on February 28, 1918, and discontinued their use in 1974, replacing them with the social security numbers of the serviceman/servicewoman. However in order to prevent identity theft and possible security breaches, in June 2011, the Pentagon stopped using social security numbers on military and dependent ID cards and reintroduced the service number. All members are expected to have their new service number by June 2015.
Of course! They want to make sure that you are healthy and fit enough to undergo service.
First search on Ancestry.com. They have many WWII and earlier records. Depending on how common the name, you'll need person's name, birth date, birth place, and residence before service. If person is deceased, you can search the Social Security Death Index on Ancestry.com. That will give you the social security number.