How to respectfully ask someone what they do in the military?

Anonymous
So I've been talking to this guy on a app not too long and he's really nice. he's in the military and will be deployed in a week.. Anyways, he only told me that he was in the military. I want to ask him what he does in the military. Like for example : navy, or army, etc. But how do I ask it in a respectful way or such?
How to respectfully ask someone what they do in the military?
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