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We found a few resources available online that list 6510 Security Police Squadron and might help narrow down some other name variations such as this one here. If you believe he served in Vietnam, Family Search has a great resource page that lists records available here.
You may also want to do some research on Ancestry and Family Search. If you can narrow down some name variations, you may be able to find city directories, vital records such as birth or marriage, or yearbook photos. Family Search does not require a subscription and can be accessed with a free account. Ancestry does require a subscription, but many public libraries offer free access with your library card.
We hope this information is helpful. Best of luck on your research!
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I found a possible match, birthdate 1947, would make him 26 in 1973.
I hope you find your birth father.
Name: Richard T Vallet, Sr Alias: Rick T Vallet Event Type: Residence Event Date: 1 Jan 1998 Event Place: Port Allen, Louisiana, United States Phone Number: (225) 928-8305 Previous Residence: Port Allen, Louisiana 70767 Birth Date: 14 Feb 1947 Second Previous Residence Place: Plaquemine, Louisiana 70765 Third Previous Residence Place: Virginia Beach, Virginia 23455 2nd Address Date: 01 Dec 1993-13 Nov 2000 3rd Address Date: 1 Dec 1991