just start out with a phone call and ask about 5-6 questions. you should be able to get the "feel" of whether or not they want to discuss the past or would rather hang up the phone. if it turns out positivie then a letter via post is in order. Geezo we have several veterans right here on the forums so you really do not have to look anywhere else. they seem genuine in all respects and have a keen interest to teach us of what the horror was like