Another thing that your husband can consider when he is brainstorming for ideas is if he likes what he does `generally` but is just looking for more a more substantial vertical move, financial freedom, wants to make his own schedule or just has that entrepreneurial bug, maybe he can think of problems `service and training related` where he thinks `better practices` could have been established and then create a such company to address those practices. Additionally since he is cross trained and you said it is specific to Miami, maybe he could 1099 himself and pursue state or fed government contracts to train students at neighboring community colleges, other firehouse people just starting out, retirees wanting to get back into the workforce and/or Office of Health and Human Services. Living in a state where the summers can be wicked with hurricanes and tropical storms and such perhaps he could train a team of people that specifically is like `the Florida Disaster & Rescue Team`. He could train and cross train emergency personnel that would be `mentally` prepared and dispatched to help government agencies and hospitals in times of crisis (albeit the weather, fires, what have you). He could also build or team with someone in the mental health profession for people having to deal with shock (loss of family, loss of home etc).
I am sure that given his level of training and certification he has strong relationships already in his field that could get him going in the right direction and if he could `duplicate` himself people would definitely appreciate him for that as well.
Anyway, I am not too familiar with your industry so that is the best advice I can offer. Hope it generates some more ideas for you.