So far, over 9,000 American M-1 tanks have been produced, and most of them subsequently updated at least once. But the army, seeking to save a billion dollars, sought to close the plant that builds and modifies the M-1. The closure would be for three years, and when it was reopened, there would be a backlog of upgrades and parts orders to fill, to keep the plant open until, perhaps, an M-1 replacement comes along.
Politicians and the operators of the plant sought to keep the plant open in order to save jobs, votes and operating profits. Thus in a largely political decision, the plant appears to be getting the money (from the taxpayers) to stay open. How long the plant will remain in business is uncertain, as is the future of the M-1 tank.