Here's one for you, although it might be a little before you started busting your knuckles on Marine Tanks. My first assignment was with 2nd Tank Bn, Force Troops, CLNC in he early '60s. The Bn had M48A3's and one Company of M103's (120mm gun) along with a Platoon of Flame Tanks (in H&S as mentioned before). Just down the road was the 2nd Anti-Tank Bn with that famous Lil' M50 Ontos (Greek = The Thing). If you are not familiar with the M50, just check it out online by entering "Marine Ontos". The "Thing" mounted six M106 RR's and the crew fired it from outside the vehicle. There's some good flics of that if you check out "The Battle of Hue City". Interestingly, the last active duty Ontos (one, kept up with spare parts by two) was used in a defensive position on GITMO in 1980, how's that for being "good to the last drop" and in the finest traditions of the Mar Cor? Back to where I was heading, did the Tank Mechs get assigned to Anti-Tank Bn's and to AMTRACS too or was there too much of a difference to allow such an economy of training. It would seem that engines and the rest of the powertrain along with suspension aspect similarities, that maybe a few course add-ons might be all that was required to do such a thing? Of note, the Mechanized Museum, MCB, Camp Pendleton will soon have an operational (except for demilled RR's) and completely resto'd M50 sometime this Fall. If you are in the area just before Christmas, you should be able to check it out along with the M48, M60, M103.
Here's an interesting aside, in all the glory stories of Patton and his tracked vehicle/armor exploits, not once have I ever read, seen or heard of him having a noteworthy encounter (positive or negative) with any of his tracked vehicle maintainers/wrenchers and their supporting efforts during his WW II exploits. You just gotta know his capabilities where in their hands and his "p-hairs" were in their grip. Anyway, God bless you guys and the armorers.