What would be the reason firefighters get transferred to a medical shift?

So my boyfriend said he got transfered to the medical truck and he said it sucks. I'm like I don't really understand why firefighters go on medical runs, I thought it was just paramedics that do those. Someone asked him what'd he do to get transferred and he said nothing, is it something he probably did to get transferred there?

What would be the reason firefighters get transferred to a medical shift?
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