This response states that traditional pensions automatically fulfill the rules of an RMD. The CALPERS benefit would have an RMD. Enter the amount from box 1.
Required minimum distribution (RMD) is the minimum withdrawal you are required to take out of your IRA (including SEPs, SARSEPs, and SIMPLE IRAs) or employer-sponsored retirement plan (such as pension, profit-sharing, 401(k), 403(b), or 457(b) plan), starting at a certain age.