I think buddy letters or performance reports are the only way to get that done.

It seems there are many of these approved if you are willing to wait through the appeals process. Read this

Citation Nr: 1729898
Decision Date: 07/27/17 Archive Date: 08/04/17

DOCKET NO. 12-28 077 ) DATE
)
)

On appeal from the
Department of Veterans Affairs Regional Office in
Muskogee, Oklahoma


THE ISSUES

1. Entitlement to service connection for type II diabetes mellitus, to include as due to exposure to herbicides.

2. Entitlement to service connection for ischemic heart disease, to include as due to exposure to herbicides.

3. Entitlement to service connection for lung cancer, to include as due to exposure to herbicides.



In March 2017, written correspondence from an archivist at the Air Force Historical Research Agency was provided regarding the Veteran's claim to herbicide exposure and daily morning reports. The archivist stated that in June 1966, the United States Air Force ceased using morning reports, so there were none to document the Veteran's time in Thailand. In addition, the archivist stated that Takhli Air Force Base did not use any herbicides for any vegetation control around its perimeter until April through September 1969, and thus the Veteran could not have incurred herbicide exposure. THEY DID APPROVE THIS APPEAL Google the citation number