According to the social security death index. There was a Eugene R Harkness who died in Pensacola FL. 24 Dec. 24 1989 According to Switchboard.com there are 3 Harkness famlies living there. Maybe one is related. As for the dogtag the LDS must stand for Latter Day Saint. If he had been Catholic there would have been a C. For Protestant a P. Jewish a J. I'm only guessing on the LDS as I had never seen it before. He has an enlisted persons service number. You use to be able to tell by the first three numbers what state he enlisted from but now they use the ssn. As for the pin will have to search. I see nothing wrong with someone wearing the dogtag. Who ever sold it must not have wanted it bad enough.