Bob, I've looked at the categories and it does look to me like there needs to be a bit of revision. For instance, right now under the category "Texas Rangers", you have "Texas Rangers, Kentucky", and several other states. It seems to me you only have Texas Rangers in Texas. Am I wrong? Does Kentucky have a group of police called Texas Rangers?
The reason this is important is that there's already a precedent that state police category is broken down by state. So the critical thing for you at the moment would be, what state is your person a State Trooper of? If it's Maryland, I would suggest placing on his profile, [[Category: Maryland State Trooper]]. If another state, substitute the name, of course.
This will be a new category, so once you save your profile, the category will show up red. Click on it and then on that page enter [[Category: Law Enforcement]]. And the new category "Maryland State Trooper" will show up under Law Enforcement just as the Texas Rangers do.
I think another state uses "State Patrol", Virginia or North Carolina. They're all different, but a number use "State Trooper", so as long as Texas has its own group, your own state should have it's own as well.
Just my humble opinion as one member of the categorization project. Anybody else from the project want to weigh in?