Because in the Vietnam War, they hadn't mastered the Chrome Carbine quite yet, and the infinite ammo clips. Years later the developement of the Chevy 1500 van with posi-traction and the functional rear deck wing.
Therefore, the acedamia have trouble passing the rest of the otherwise true story on to our collegate youths.
Fact one- If you have a Chrome Carbine, you can't take a bullet, you're damned near bullet proof.
Fact two- There can only be one successful war-comedy/drama per war, and the A-Team was it. Since it was a real crack Vietnam team carefully illustrated in 1980's Prime time, there was simply no need to teach college kids the brilliantly obvious, Since it's on TV, it should be in our histrios books.
You young skulls full of mush.