I did not know that.
When I heard new and had to be enough to keep the line open I thought it was ground be new
The US Military has long been a specialist in reusing our old equipment.
Tanks are so expensive that unless there is a major change to the hull, we just reuse the hull. And at the time that the M1 was new, the US was fielding 3 Armored Divisions.
But the 3rd AD was shut down in 1992, the 2nd AD was shut down in 1995. So with only 1 Armored Division left, the US had a ton of excess M1 tanks laying around. Even after it was able to replace all of the M60 tanks being used by the Marine Corps and in the National Guard and Reserves.
What has happened since then is that we have large stockpiles of M1 tank hulls. Most of which sit at the Sierra Army Depot, in NE California.
Google Maps
This is the land vehicle version of Davis-Monthan AFB. Where all of the excess tanks, APCs, and other vehicles go. And the tanks generally sit here until more tanks are needed, either by the US or another nation. They are then pulled out, put onto trains and shipped to the Lima Army Tank Plant in Ohio. There they are stripped to the bare hull and rebuilt. After all, there is absolutely no difference between the hull of an original M1 and the hull of an M1A2.
But since it is a complete hull down replacement it is essentially a brand new tank. Not even the paint is left, they literally strip it down to the bare metal and start again from there.
Heck, we even reuse old aircraft.
Whenever we did PATRIOT test fire missions at White Sands Missile Range, it was against aircraft of the 82nd Aerial Target Squadron. Primarily F-4 Phantom II jets converted to unmanned drones. Today the QF-4 have all been expended, so today the target drone in use is the QF-16. And yes, they are made from F-16s that have been retired and converted to use as target drones.
And that link is really mind blowing, when you realize as you zoom in that each of those dark lines are row after row after row of military vehicles. Hundreds upon hundreds of M1 and M60 tanks. M113 and M2 APCs. Fuelers, cargo trucks, HMMWVs, about the only military vehicle I have not been able to find there are PATRIOT launchers. Of course, we have never shut down a PATRIOT unit, so I would not expect to find any. We have not made any of those in decades, and we still call upon active duty units to do test missions for upgrades.