Which MOSs are likely to be stationed in Korea or Japan? Are there a lot of 92As in either of those places?

Research it yourself, those number change over time anyway.

88M would be one that they would have there, , along with 11B.

Korea does not discriminate against MOSs, and yes there are a lot of 92As there.

Air Defense Artillery and 11B

Yes, I was 92A, 2nd ID, Camp Casey 1994 to 1995

The Aviation MOS's, as well as combat arms, and combat support. I think the only MOS's I never saw the Boat MOS's there

If I had to guess, off nature alone, 74D CBRN (My MOS) is pretty likely to be stationed in S. Korea or Japan

92A’s can be found everywhere.
1. Most motor pools have a Sams-e clerk.
2. Supply Warehouses.
3. Class-1 (subsistence) supply locations.
4. Logistical units, sections, shops.

35 series has a great chance. Full brigade there in Korea and more in Japan.

A lot.