If those are the tanks i know about , they were damaged (not destroyed)by enemy fire, and due to the high tempo of the American advance it was decided to leave the tanks and destroy what could not be removed quickly ,the crew would have removed the coax and the 50. cal to deny them to the enemy, removed the ammo and other various items like NVG's and GPS's they probably took the apart some of the gun breech too, then they threw in a thermite grenade, or in the case of one of the tanks, one of the other tanks in the company (probably his wingman) shot a round into it to destroy it(imagine being that gunner!). i saw the tank that was destroyed by another M1. none of the crews were killed (I think). i was not in that specific unit, but that is how i understood it. just in case u were wondering the second tank was damaged by some type of sabot round the size of a pencil and is still being investigated by the army, they say they don't know what type of weapon it came from. the gunner of that tank was lucky, his vest was peirced by the round through the back but he was not hurt. there is actually an article about it in the army times. sorry i got long winded