And just to explain what that means, I would get 50% of my "high 3" meaning they would average the highest 3 years of salary and give me 50% of that per month for the rest of my life.
I was an E5 (second class petty officer) when I left the Navy after 6 years. I could have taken the test for, and maybe become, an E6 (first class petty officer) before I left, but I knew I was leaving so I didn't. Advancement beyond E6 is political and much more difficult, but I'm guessing I would probably have made chief (E7) by now. E7 might have been my ceiling, so I'll just assume my high-3 would have been at E7 pay. E7 at greater than 16 years is $4297.50 right now (that's base pay, and that's what the pension is based on. There are many allowances and other types of pay in the military, but that's besides the point). So in four years I'd be getting $2150-ish/month.
Man, I liked the Navy. Liked it more than anything I've done since. I'm a dumbass.