How do I convince my boyfriend that he shouldn't go into the army?

I'm dating this guy and we've known each other for 4 years and I really really love him and he just told me that in the future he wants to go into the army.and I really REALLY don't want to lose him. and he wants me to prove that I don't want him to go or to convince me out of his decision but I don't know what to say. any help?
How do I convince my boyfriend that he shouldn't go into the army?
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