I got one only yesterday from a retired US military man who was desperate to be my friend. I don't know why they're so often soldiers. If I was in the market for a man, which I'm not, a American soldier wouldn't be my ideal. I don't think we would have much in common, given my strongly left-leaning political opinions.
Why don't they try to branch out a bit? I would quite like to be chatted up by a historian or an archaeologist, but I suppose that might be a bit out of the scammer's league. How about a gardener? That could be charming. A bit difficult, though, if you're pretending to be American and the only gardening you've ever done is in Nigeria.