The admissions counselors have historically been active duty junior officers. They eventually transfer to a new job or get out of the military. That is likely the reason. There has been discussion of eventually replacing one of the two folks supporting each region with a civilian, which will provide added continuity but don't think this has yet occurred.
Routine...happens every year about this time. While there maybe some knowlege gap and getting up to speed, you can rest assured its pretty seamless. By this time in their short Naval/USMC careers,they already done several job change/turnovers.