"The final model to actually hit the battlefield, the M1-60-7 sported an artillery cannon with 54mm of penetration. This meant it was used actively in bunker busting operations. Additionally, being made of an artillery cannon resulted in these tanks mostly stocking APHE. Once the problem of the M1-33-7 was noticed, the tank's stockpile was reduced back to 30 shells, meaning it had to actively avoid combat. This was made worse by the T13, which was the enemy response to the M1, and could frontally penetrate the M1, even at an angle."