PurpleheartOklahoma (scroll down)

1) From www.military.com:

http://www.military.com/buddy-finder/

 2) From Veterans For Change:

Veterans-For-Change has databases with 236,590 former military listed.
If you’re looking for a buddy, send an E-Mail to JDAVIS92840@SBCGLOBAL.NET with the First and Last Name, Last City/State known, and Branch of Service and we’ll respond with all those listed within 7-10 days.
Please keep request to no more than two names, and only place your request one time.  If the person you are trying to locate isn’t found it goes on a wait list to check new databases as received.
If you’d like to be included, please E-Mail me and request a buddy list entry form.
This is another FREE service of Veterans-For-Change!

3) From: Together we served:

Locate Marines (and the other military service's members) You Served With. Run by retired military, TogetherWeServed.com (TWS) is the largest military heritage website for current and former U.S. service members to reconnect with old friends. No matter where you live, where you were stationed, or when/where you served, you can quickly and easily search for and find former Marine Brothers and Sisters through TogetherWeServed.com. TWS is connecting service members more than any other entity – it currently includes profiles of more than 1.2 million veterans (300,000 Marines) and active duty members from the Army, Navy, Air Force, Marines and Coast Guard. With more than 2.5 million photos, videos, and stories, TogetherWeServed.com has one of the largest collections of visual military memoirs in existence.

Joseph Barca, PFC, a TWS member since 2005, commented: "Thank you for keeping this site free of phonies and advertising, that alone is worth a lot and finding a lost buddy is worth a whole lot more. I've found 15 so far through TWS. Hats off to you and the TWS staff - still the best Marine site on the net."

 4)

Good Vietnam people search engine

I am passing this along because it is probably the best search list ever compiled about the Vietnam War.

 This simply has to be shared with anyone who ever served in Vietnam or knew someone who served in Vietnam .

It would take months to look at everything this site offers.