I retired from Virginia Tech as a professor. Is my pension RMD obligated?

Say all of it is the RMD.   If you need to take the RMD it will ask you if it is the RMD.  Say yes.  Anything your pension pays you is considered to be the  RMD.  Traditional pensions automatically fulfill the rules of an RMD. So for the RMD question put in the same amount as box 1.

VA has a couple of different retirement options for faculty at the state universities.  If you have the actual pension, then the entire payment is considered the RMD (because the pension payout is partly calculated on your life expectancy.)  If you were enrolled in the optional retirement plan (which is a combination of a 401(a) and 403(b) ), and you can choose to withdraw or not withdraw, then you do have an RMD requirement.