the likelihood an american foreign service employee would ever need to use a celtic language is not very high. similar probably holds for basque which i hear is not the easiest to learn either.
Yes, poorly explained on my comment (not native english speaker, obviously). I just wanted to point out the region where basque is spoken. Thanks for the info.
In fact, if you check the map, there's a gray spot on the north of Spain/South of France. That's Euskadi (Basque Country area).