You select it as a standard Form 1099-R where asked in the section for entering retirement income.
To enter, edit or delete a form 1099-R -
Click on Federal Taxes (Personal using Home and Business)
Click on Wages and Income (Personal Income using Home and Business)
Click on I'll choose what I work on (if shown)
Scroll down to Retirement Plans and Social Security
On IRA, 401(k), Pension Plan Withdrawals (1099-R), click the start or update button
Online editions -
On the screen Did you get a 1099-R in 2024? Click on Yes
On the screen Let's import your tax info Click on Change how I enter my form
On the screen How do you want to add your 1099‑R? Click on Type it in myself
On the screen Who gave you a 1099-R? select the type of 1099-R you received and Continue
All retirement accounts use the same 1099R for IRA and Pensions. Is it asking if you took the RMD for it? Say the whole amount is the RMD. Anything the military pension pays you is considered to be the RMD. Pension will go on 1040 line 5a and 5b. IRAs go on 1040 line 4.