I'm a German native speaker at a University in Germany. In our CubeSat project, we all use English most of the time. A good third of the students are foreign, from India, Eastern Europe, Turkey and the rest of the world.

We chose to speak a language _native to none of us_ to be _inclusive to all_. Everybody speaks English to such an extent that it becomes the lingua france of students in Germany. I think students coming to the US should be able to use English, too. Especially given the TOFL/whatever language test you have to pass to be admitted.

Btw, a common story the exchange students tell is how stupid the other exchange students who only stay among themselves are.