How do you flirt with a marine?

They are such gentlemen that I don’t even know how to. I met one around town and I see him like once a week. I just wanna figure out how to initiate a conversation with him and how to give it a more flirty turn even if we are still talking about his military stuff. HOW DO I FLIRT? (It’s at the gym)
How do you flirt with a marine?
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