Getting married to soon

Lanise • I`m 22 and ttc baby #1 but was on depo
So my boyfriend is talking about going to the national guards and want to get engaged or married first. We've only been together 2 years yes we live together this relationship moved very fast know I don't have doubt that he love me or I love him I just want this to be the best decision for the both of us. Since he will be away for a while and we ate use to spending every day together. He also wants to ttc before he enlist.Some one help me with this military stuff? We are only 21.