re: #405 Wendell Zurkowitz (slave to the waffle light)

We refused to build the British-designed 17-pounder anti-tank gun in WWII, the only thing capable of defeating German armor. We wound up retrofitting it on our Shermans.

No, the USA never retrofitted any Shermans with 17-pounders. A small number of M4A3s (exact number and source cite to follow) were retrofitted for the 17-Pounder, but those were refitted in the UK by Britons.