I'll add in, perhaps unnecessarily, that while having served (especially in wartime, and most especially in a hot zone) gives a man's opinion a certain special weight, the converse is not necessarily true. You cannot question someone's patriotism and devotion to country simply because they never served. (I mean the generic "you" here, not you personally.)
You'd be impugning the patriotism of nearly all women, who either could not serve or could only serve in the limited capacities until recently. (My mother, BTW, welded Victory ships until she married in 1944.)
You'd be impugning everyone who was classed 4-F. (I never put it to the final test, but I believe I may have been 4-F in my eligibility years for reasons that were later surgically corrected.)
You'd be impugning those who are sincere conscientious objectors - and they do exist.
Military service can be a quick touchstone to a man's position and thinking, but right now, with no trouble at all, I could name ten combat veterans whose political and ethical outlooks run the full gamut, including expatriates who will not set foot in the US again for considered ethical reasons. Any notion that it is a hallmark of a Jimmy Stewart (note I didn't say John "draft dodger" Wayne), flag-saluting, right-wing Patriot is largely nonsense.
So I really hope that wasn't where you intended to go with this.
