I saw that too. It’s a shame that we don’t have a higher percentage of citizens who served in the military. You see evidence of that all the time.
Having not served myself, I had often asked ‘where do we get these people’, also.
My answer came a few years ago when I noticed something in the faces and eyes of each and every picture I saw of an American service man and woman: it is the distinct look of “love”.
There is no other explanation that I can think of. I no longer ask where these people come from. I thank God they are here and that their love will never die.