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You may have some luck getting some information from the following. Would contact them.
National Navy UDT-SEAL Museum
3300 N. Hwy. A1A
North Hutchinson Island
Fort Pierce, FL 34949
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Dear Mr. Lora,
Thank you for posting your request on History Hub!
Officially, SEAL Team 1 did not enter Vietnam until 1966 when Detachment G was attached to Operation Game Warden (TF 116). The Task Force took over policing the Rung Sat Special Zone. Other SEAL units may have been in Vietnam prior to that but they may have been attached to other Operations or units at the time.
For more information about SEAL units and UDTs, we suggest that you contact the Operational Archives Branch, Naval History & Heritage Command, 805 Kidder Breese Street, SE, Washington Navy Yard, Washington, DC 20374-5060.
We hope this is helpful. Best of luck with your research!
[Information provided by Nate Patch, Subject Matter Expert]