OP,
I think you are in the same boat as we are being military family. I'm not sure if you are retiring at number of years but my husband just retired after 20.5 years active army.
He decided at 18 years he was done and ready to retire. Okay, so let's make a plan and go forth.
I broke down the plan into increments so I could get an idea of what the actual budget would be after retirement. I did NOT add in any VA disability or extra pays. I wanted to use a budget simply on what we were spending now to include savings, any future car payments and likely moves.
For the first year, we paid off all extra debt to include car payments, 0% interest best buy, and anything else floating out there while still putting away savings.
The year leading up to retirement was learning to really budget and hit savings hard. My goal was to have close to 100k liquid cash before retirement. I didn't know where the world we were going at that point or what was next in our journey. I basically took out an extra 1k a month and put in a blind savings account that only had one card linked to it and that was locked in the bank. So, I did something that most would say is completely unpopular, I reduced retirement account deposits. BUT being that my husband would draw a check starting immediately and forever as guaranteed cash money, I saw it as a balance. I wanted to have much liquid as possible until I knew what was next for us.
There are some weird unknown factors for retirement. Are you going to use Tricare prime or Tricare standard? If you use prime don't forget the yearly fee. If going with Tricare standard, then it's factoring in medical costs like copays and deductibles and in network out of network and maximum out of pocket costs. These are the things we are navigating now as my husband just officially retired in June this year and we are already facing our first medical hurdle for myself and understanding how insurance really works outside any MTFs or Primary Care.
Another retirement conversation was about life insurance and using VGLI upon retirement or getting life insurance out in the economy. Oh and we had a long conversation about Survivor's Benefit and did we want that deducted every month from his retirement check.
The one thing I had to really keep in mind when understanding how much retirement check would be was it is just base pay. Not to include BAH, BAS, any job pay incentives or anything else just strictly base pay and typically divided by 2 to give you a good idea of generic and that is before taxes and allotments or anything else.
Sorry to be so long winded, I really didn't have any idea about all this before starting down this road with my husband. If I can give any tips please let me know.
Good luck!