I have a potential customer who is asking for a recommendation on a good knife for EMT/FF use. His principal request is a knife that will quickly and easily cut seat belts. I haven't had much luck finding a specialized knife, and I really don't want to take the "well, these look sharp" approach, so I thought I'd ask here. What do you carry for duty use? What have you tried in the past? What do you look for in a knife? Thanks for your responses, and keep safe!