My boyfriend served in the last year of Afghanistan and he can't be around fireworks. How do I help?

I'm not sure when he was there or how long. All ik is when they evacuated Afghanistan. He told me the stories. I've watched some news of people clinging to the planes because they didn't want to stay.

It's fireworks' reason and he is being set off again. He says he has done therapy and has certain ways to help but I don't know if I can help more. He says the fireworks remind him of artillery. Please help.
My boyfriend served in the last year of Afghanistan and he can't be around fireworks. How do I help?
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