I am not familiar with Marfan's syndrome, but I am familiar with the human body's ability to heal itself, given the right foods & protocols.
Dr. Schulze 's biography includes three different instances where he actually regenerated skin, tissue, ligaments, muscles, etc, that the medical profession told him was an impossibility.
At the top of every Curezone page, is a link to Dr. Schulze . First, read his biography for encouragment, then check out his Incurables Program.
It sounds to me like it will take something as completely organized, well-documented, tested, and thorough as his Incurables Program to create a healing for yourself. It seems you've already proven that doing just "one thing at time" or an assorted variety of supplements isn't going to be the answer. My guess is it will take a total lifestyle/dietary re-education and change.
I don't mean to be discouraging, but I do feel it necessary to note the following: even if you accomplish a total cure, entering the military will probably "undo" it in time. The standard diet of the military is laden with lifeless, canned, toxin-laden, chemically processed foods & beverages...with virtually nothing fresh, 'alive' or organic in nature.
You CAN win over the situtation; it's just going to take some serious effort & research.