It is all about timing...though not a helo pilot, my community also is often given the opportunity to serve in Kodiak. I think it involves timing, as I have seen no 60 pilots go to Alaska from my previous unit...that is a rarity however. With two 60 units up there (Sitka and Kodiak), the chances of doing a tour up there are good.
Usually not your first tour, however.
Also, for married folks it is 3 years, for unmarried it is 2 years.
Hope this helps.