Tanks v. AFVs

[raketenjagdpanzer]

Hey all...

I was doing some back-of-the-envelope calculations last night, and per what I was able to pull out of the NATO Vehicle Guide, I came up with about 140 or so "tanks" per the guidebook that are operational and listed in US military stocks.

What I'm interested in is: does this mean just what it says - tanks (M48, M60, Leo-1, Leo-2, Leo-3, ad-hoc captures and other acquisitions of MBTs), are we to assume that can mean anything from an M113 up to an MBT? Or is it strictly tanks but support vehicles are also to be considered? Like 1.5 or 2 to 1 IFV/APC/other armored vehicles?

This last option would seem to make the most sense; i.e., if a unit is listed as having 8 tanks, it also operates with 10-12 APCs (M113, Marder, Luchs, etc.)