Advice on Marine Corps Bf and deployments

So I flew out to Cali to see him for a few days and it was sooo great. But now I’ve found myself kind of panicking. He is Marine Corps recon and will deploy at some point soon after his training. It’s just really scary and i was hoping some ladies who’ve gone through this could help me figure out how to deal with him leaving.. I go to a military school and thought it would be easier to handle this but it isnt.

I just honestly think I could spend my life with this man and it’s terrifying to think of how wrong everything could go with his job.