I believe this where you learn one of real oddities of ProConnect Tax (and Lacerte). How do you enter ZERO (0). You enter NEGATIVE ONE (-1). In this software ZERO (0) really is nothing, that is - it is totally ignored.

Scroll down in the details of the pension input and find box (17) and go to the next box for State taxable amount, in different. Enter -1

I would not find a specific check box for an indicator that it is military or in state pension. 

If there is a specific line in the return that would show, this you can Check Return, find the form or line and click on it to get to the input.

I DO NOT DO AL TAX RETURNS, so this is a best guess