The first thing you might try is going to a site like
http://www.militaryonesource.com/skins/MOS/home.aspx or this one
http://www.defenselink.mil/ and begin there. We here mainly participate in discussion, as well as try to help individuals get pointed in the right direction when they are seeking solutions to problems such as yourself, but you will have to do the legwork to find your dad - It may not be easy! But I'm sure with a little time and effort you'll make progress. If we CAN be a tool for communication between yourself and your dad that would be great! We wish you luck - please let us know if you locate him or not!