The USMC is saying it is going out of the Tank business as it transitions to a new strategy for its force structure and missions.
The Marines had three Battalions of 58 Tanks each with a Prepositioned strength of about 58 Tanks plus some used in Training units.....ball park number about 300 Tanks in total.
Factor that into the total number of Tanks held by the US Military when doing the math on force size.