Endangered Languages

There's a Navajo-US Army dictionary. Very amusing.
http://www.history.navy.mil/faqs/faq61-4.htm

<<Also, learning a local dialect at school as a third language should be standard.>>

Don't we already learn our local dialect at school?

In California, as far as I know, I was taught in "Californian", and when I moved to Kentucky, I was then taught in "southern". When I moved to New York, my education continued in both downstate and upstate "New Yorkese". When I was in South Dakota, I was presumably learning the "South Dakotan" dialect.