Mish: Always remember there is always a "Plan B". Life doesn't always go exactly the way we plan but we can be flexible enough to roll with it. Marc has good health and he will choose another path. You can't even know that everything in the military would have worked out fine for him. One of my closest friends has a son who joined the military and planned his career. Now, 2 years in - he is leaving. It just wasn't his cup of tea.
There is more than one way to live a good life. It's all in the mindset.