Probably true, but raises another question: do you learn a language to pass a test or earn a rating, or do you learn it to communicate with the local populace?
This lazy multilingual once learned a language by drinking palm wine in the shade with some helpful, loquacious, and equally lazy native speakers... and learned faster than some people who were sweating it out in a classroom (long story).
Yes
Yes again
That's pretty much my theory as well.
Particularly when there's no way to know what language will be in demand next, when deployments are of limited duration, and in places where security concerns limit opportunities for immersion.
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