Between January 9, 1962, and May 7, 1975, you must have served for any length of time in at least one of these locations:
In the Republic of Vietnam, or
Aboard a U.S. military vessel that operated in the inland waterways of Vietnam, or
On a vessel operating not more than 12 nautical miles seaward from the demarcation line of the waters of Vietnam and Cambodia, or
On regular perimeter duty on the fenced-in perimeters of a U.S. Army installation in Thailand or a Royal Thai Air Force base. These bases include U-Tapao, Ubon, Nakhon Phanom, Udorn, Takhli, Korat, or Don Muang.
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The state of Tennessee has veteran advocates that will do all the paperwork. They filed for me and I was given disability within 6 months. Check with your state or VFW before doing anything directly with the VA as far as filing. Good luck.