Chewy, with respect, you know nothing of this.
9D4, let's be honest. Your femur is pinned together and will be for quite some time, and you're being evaluated for a total hip replacement in your twenties, and you already have vision issues. You'll likely need more surgeries in the not-too-distant future. If you were already enlisted, that would be one thing, but you're not. With that sort of history, you're not getting into the WW2 or Vietnam draft army, much less the 2015 all-volunteer force. It's just too much risk of causing further injury and disability in any reasonable future. Your injury is not waiverable for enlistment, much less combat arms, much less special forces and the like.
Best to refocus on goals that are achievable. If you dream of national service, there's plenty of good alternatives to the military that do not require physicals.