Never left the country?

[Munchkin03]

I was talking to a friend the other day who brought up the fact that most Americans don't leave the country...ever. My perspective is skewed because not only did I grow up in a military town, I went to college with a lot of international students...it wasn't until graduate school that I had met people who had never left the continental US.

For those GC-ers who have never left the States, do you have a reason? I figure we're a pretty representative sample...