So your retirement date is after your anniversary date? In that case, yes you'll get 15 and a good year.

But the good year is meaningless for retirement pay purposes...they only count for retirement eligibility, once you get 20 you don't need any more.

The points continue to add up and contribute to your multiplier, this increasing retirement pay.

As you as you hold a commission (TR/SELRES or IRR) your years of federal service accumulates, increasing your base pay and retirement rate.