Colonel McGregor had a semi-legendary status at Fort Riley. After the Gulf War, he took command of 1-4 Cav at Fort Riley, and had a reputation of being incredibly demanding - and would relieve officers of their command if they performed poorly in training. And he beat the OPFOR at the National training center. This is almost unheard of, since the deck is stacked against you - but he beat them several times during his rotation there. So I definitely am familiar with his name - he was so good, the Army wouldn't promote him to general :( But to answer your question - yes, we most definitely would fight in a dug in position. We would practice pulling up out of the hole, so the gun was clear, firing a round, and ducking back in the hole. This would be while on the defense. Below is a diagram of the concept. Keep in mind the M1 was developed in the 1970's. At that time, the main purpose of our tank force was to defend the Fulda Gap in Germany against a Soviet invasion. And while I was in Korea, we prepared plans for our static positions...again because we anticipated defending, while the Norks poured in. So, even though the M1 has an amazing offensive capability, it was developed with defense in mind. Now, as it turns out, I don't believe its ever actually been used that way, in a hot war. They were on the offense in both Gulf Wars...and then were used as patrol vehicles in Iraq (with tragic results). So you are correct that we have never actually fought that way - but it is embedded in our doctrine. Who knows, maybe we'll end up defending Poland after Ukraine becomes Ruskified.
