When the XM-1 Battalion was undergoing its field trails at Fort Hood in 1981 there was a rather amusing accident that took place. One of the tests of the new tank was to run it couple of times around Ft Hood. On the main tank trail there was a small switchback that climbed a small limestone cliff of about 15 feet...
During a night road march, under simulated NBC conditions, one driver got a little too comfortable and went to sleep. He awoke to his TC screaming at him to stop, a little too late and the tank ran right into the cliff. The loader of the tank lost a few teeth when he was slammed into his machinegun mount and the tank commander, wasn't holding on tight enough, he was thrown from the tank and impacted the cliff face and fell down, breaking both legs. By the time my tank had pulled up, the TC had managed to crawl back up on the tank, had gotten the driver by the throat and was punching him.
