I'm not an administrator or anything, just a member but all I needed was DD214
Any Veteran who served in any year and in any branch of service, only needs their DD214 seperation paper, as Iong as their DD214 shows "Honorable discharge" and Not Dishonorable, are welcome in American Legion or VFW in the United States of America!
If you were enlisted in the military at some point, you should need documentation of that. If you were sponsored by a veteran, then you will need the documentation of your sponsor's service.
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