Sorry, but IMHO there should only be two classifications: service-related and non-service related.
If you're in uniform, on duty (and technically, you're ALWAYS on duty in a combat zone), and whatever happened to you wasn't a result of your negligence or design, then it's service-related and you get the same benefits whether you got shot, hit with an IED, or had a car drop on your leg while changing a tire.
It's kind of insulting that someone, merely because of their location or function they were fulfilling, somehow isn't entitled to the same benefits and treatment for their injuries. Were they not also doing their part to fulfill the mission? Are they somehow second-class soldiers simply because they weren't "making bang-bang" against the bad guys?
If your injuries are in the line of duty, regardless of that duty, you should be covered. Period. Levin is a ****tard who'll never get that.