@Nords might weigh in as well, he's very versed on the mil side of FIRE and has written a couple of articles on the value of the mil pension. You should be able to find it through a Google search (include The Military Guide in your search query).
Thanks for the tag, ExFlyBoy5!
[First, a note to the rest of the forum. I'm not a member of the retention team, and this post is not intended to suggest that it's worth staying in the military for the pension. When active duty is no longer challenging & fulfilling, then it's time to transfer to the Guard or Reserve... or even go full civilian. Don't worry about pensions. Military families have far too much human capital to gut it out to 20.]
Need? No need.
Just trying to quantify it, see if it was worth it, use it to guide my kids decisions, my coworkers decisions (still a contractor for the military).
I guess for what I want the number for my original calculation meets the need...
Using the 3% SWR I want an $80k retirement.
I guess I could just as easily ignore the retirement and say I want $52,500 using the 3% rule, in the end the final numbers are the same.
Of course as we age and medical problems kick in the value of Tri-Care my be the real win...and I won't even try and calculate that.
I use I bonds for two reasons. First, as far as I can tell they're the easiest proxy to use to check your inflation-adjusted life-annuity math. This may not be rigorous, and you certainly can't buy that many I bonds, but they're an easy proxy.
A TIPS fund might work too, as long as you can easily find the yield. Maybe Vanguard's TIPS fund is a good proxy.
Second, when your inflation-adjusted pension is the equivalent of your bond asset allocation, you don't need to invest in annuities or bonds. You might not even need to invest in real estate-- you could just put the remainder of your assets in a total stock market index fund (with low expense ratios). Hopefully you won't be upset by the volatility of the stock market, because the inflation-adjusted life annuity has no volatility.
Your $27,500 annual income could be delivered by a portfolio of I bonds. This month they're yielding 1.68%, so the value of your pension would be ~$1.6M.
Here's some other methods from a post that's nearly six years old:
https://the-military-guide.com/present-value-estimate-of-a-military-pension/
I'm not sure whether companies still offer quotes on inflation-adjusted annuities.
[This is a flawed analogy. If you're a nuke like me, then we can stipulate that this analogy has its limits, and there's no need to nitpick.]
My scoreboard is binary. Are you qualified to wear these? If not, no amount of money in the world can make up for that lack.
"Life is simple. You're either qualified or you're delinquent."
-- All of my XOs.