Certainly one of the areas that Canada offers a lot of training in is languages, through our military training cooperation program. At senior levels in many of the new NATO countries, English is spoken quite well and widely, but sometimes if you had been down at the tactical level, I would expect some of our soldiers would have been interacting with Polish soldiers, some of whom would not have spoken a lot of English.
There are some practical challenges with that, but these are starting to reduce over time as the capability of those nations increases, and the operating language of NATO certainly is English.