How do you write a letter you don't expect a response to?

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I mentioned in another discussion that I adopted 2 soldiers from adoptaussoldier.org recently, and in every package I try to include a letter. This is where the tough part comes in: thinking of something to WRITE about! I've never been all that good with talking about myself, and I would imagine that a soldier who doesn't even know you really doesn't care to read all about someone they don't know. Something that makes it more difficult is that it's not like writing a letter to a penpal; where you can expect a response, and therefore don't feel silly in asking questions and initiating a conversation of sorts (in writing). With adopting soldiers, you really can never expect a response - a lot of them don't have the time and resources to write letters - and also, a lot of them choose not to for whatever reason. I can't help but ask questions in my letters, though. Do you think this is weird? I want to seem interested in their lives and army experiences - but I don't want to have them feel like I EXPECT or am DEMANDING a response out of them. So, should I be asking questions in my letters, then? And what else can I talk about? Current events? My political views? My favorite TV show? I'm really and truly at a loss. Any help you can give would be great.