Where do I enter my Thrift Savings Plan (TSP) contribution with the code AA? Am I entitled to the Retirement Savings Credit with it?

I am filing my taxes and I have both codes D and AA in Blk 12 entered into the W-2 section, I know the D is accounted for with my wages, but is there somewhere I need to account for the AA code, and is it eligible for the Retirement Savings Credit?