Marriage for Kids?

My boyfriend wants to go to Vegas or a cruise ship wedding when he gets back from deployment. We are also going to start trying for kids then but he says he wants to be married before we have kids. 
Does he just want to get married to have kids? Would you be worried he's not taking marriage seriously?
I've already done the big church wedding and am fine eloping but I want it to be real still. I want him to understand the commitment not just getting married before  kids cause that's typically the path or next step.
Thoughts?

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