SH_MM, some of the protection level bullets are familiar, some less so.
The XM1 spec is thoroughly documented--Hunnicutt's "Abrams..." and other docs.
The MBT80 is documented with in this thread.
Some/all of the Leo-2AV spec is referenced elsewhere in the forum (still reading through it).
The only reference to T-72 protection levels I've seen is a general comment in one of Zaloga's Osprey books(?)
It's a very nice summary, so I'd love to see the sources I'm missing that provide the additional specificity. My search terms may have failed me and I may have missed the links b/c I'm new to the site...