At Eurocontrol, Maastricht you don't need to know Dutch
No, but a little helps. Outside work you'll be living in the local community and an attempt to speak the language works wonders with the locals even though 99% speak English. Of course many of the Germans live in Germany still and a lot of the Francophones in Belgium.
And although it shouldn't be done, a lot of co-ordination with adjacent/subjacent units is done in another language.
Good luck to you all - and if you get through, don't forget to be nice to your training officer and supervisor - lots of coffee helps
