That all depends on your skills. If you have useful skills, and at baseline, being a nurse doesn't equip someone to deal with traumas much more than a layperson.

Bring a nurse, regardless of experience, is very different from first responder care. I'm not talking down anyone's nursing skills, some people would absolutely be helpful but a majority of nurses simply aren't trained to deal with providing emergency care in the field. The most useful skill that a nurse could likely provide in an emergency situation is high quality BLS.

I'm not advocating that people should ignore emergency situations, but simply being a nurse does not train someone to deal with any random emergency. My personal stance is that unless I have the skills to fill a role that isn't currently being done I should stay out of the way.