We as a country have grown this sort of blind worship of those who served in the military. They're not all great people. Many are, but it is not a universal default. There are shmucks and jerks who have served. Lee Harvy Oswald served in the Marines. John Allen Muhammad (DC sniper) and Nical Malik Hasan (Ft. hood shooter) both served in the Army. The military even runs their own criminal justice system because they're human, and there are good ones and bad ones in the mix. If these tours were veterans it would add an angle of sympathy, but it doesn't change that they're exploiting the system for their financial gain.
IMO it's an overreaction in an attempt to assuage our collective guilt over how our Viet Nam Vets were treated in the late 60s/70s. These were young men who, for the most part, were drafted and had no choice - unless they chose to be imprisoned, or leave the country, or were able to stay in school until it was over. They died and were wounded by the thousands. Anti-War protesters reviled them, and even supporters just wanted them to come back and act as if nothing had ever happened. No thanks, no counseling, poor medical treatment, etc. My brother came back a different person, and still bears the scars - both physical and emotional. Some classmates never returned.
People finally realized how shamefully the country as a whole had treated them, and most have vowed that it will never happen again.