I see nothing wrong with this statement. He was highlighting the bravery of soldiers who choose to risk their life to serve their country.
This. Trump says dumb and/or offensive stuff all the time, but I'm pretty sure this was his intent here. Could have been better worded, but I don't think this is that bad.
I think I agree with you in terms of what was probably his intention at the time. But the fact that he can't realize in hindsight that it was a poor choice of words and explain at least even that much (if not apologize directly) makes it pretty bad in my mind.