Can you give next step relationship advice? See details.
So my boyfriend wants to get engaged. We've been dating for three years, and we lived together for 4 months before he deployed. He's ready to take it there when he gets back, and I would LOVE to. But, he's in the army, and while that's alright with me right now and through the end of his contract (in 5 years) I really don't want him extending it. Five years from now I'll be 28, he'll be 30, and adding any more time after that (in multi-year bundles) cuts into the time when we would want to be having kids.
How do I bring this up with him without seeming to ultimatum him?