My boyfriend wants to join the army, we have twins you

This is me and my boyfriend's story if you haven't read it.

When the motel let him go boyfriend came up to the room. I had already finished cleaning and was bathing the twins. My boyfriend said an Army recruiting checked in today and they talked and he gave him his card. He started saying that maybe the military would be good for our family. I said he's crazy because that means he will be getting deployed and we won't really see him. But he's say since ill be 18 in 1 and him in 2 we can get married and we can live on base together. I said that's not a good reason to get married and he said we've been together since we were in 7th grade and he can't imagine his life without me and he knows he wants to marry me. He said we could even come up with a new last name and forget our shitty families, but that we need to think about our kids. They don't have health insurance, we barely get by and they can't spend the rest of their lives in a motel. It became a huge argument and he ended up saying he won't do it if I really don't want him to and he wants us to be on the same page.... How would you guys feel about this?

Edit: Thank you guys for the advice! I know he just wants what's best. Before he could even do it he would have to get his GED, which he could take the test at the local community college. We could ask the motel owners wife for help with that. Whatever we decide I know we will go through it together and I know I want to marry him too.. We've been through my teen pregnancy together. Abuse together. Homelessness together. We have been by each others side. Some nights pur kids ate and we went to bed hungry and we cried together. Maybe this is what's best for our family. Honestly being a military family can't be worse than what we've already been through together.