Thanks, Disagreeable. I wasn't sure if the license was irrevocably tied to a place of residence. I know that moving from one state to another requires switching over within a certain period of time. I just wasn't sure if being out of the country was similar or not.

I knew it was a long shot, but I knew that US citizens overseas still participate in federal elections for their last place of residence. Part of me was hoping that as long as the WA license wasn't expired, I could still use it as it was my last US residence. But upon reconsideration, I can see how that is a false analogy.

Would I be legally permitted to get a CA license to allow me to drive those two weeks, supplying my sister's home address (with her permission)? If not, I'll try to sort out a EU license before then. Just not really looking forward to a foreign driving test in a foreign language...