A few quick points...

ANP (at the lower levels) are local to the area so if you’re working with them know Pashto.

ANA more than likely they will be speaking Dari because they are from all over the country (working in the south is considered a "hardship duty")

Something that you might find interesting is that the majority of senior officer do have some Russian training which you'll have to take the good with the bad (understanding of maps and tactics but is extremely stove-piped and corrupt).

A good terp is vital... spend the 300-500 dollars (each) a month to get a good group of them