Short answers, pulled from the story.
The Army restarted the M1 Abrams tank program in January 1972 under Major General William Desobry with the Main Battle Tank Task Force. This initiative followed the December 1971 congressional cancellation of the XM803 austere version due to cost and reliability concerns.
The Defense Department awarded the $4.9 billion development contract to Chrysler in November 1976. This decision came after a political directive from Defense Secretary Donald Rumsfeld required a turbine engine, which only Chrysler possessed at that time.
A total of 3,273 M1 Abrams tanks were produced between 1979 and 1985. These early vehicles featured Chobham composite armor consisting of ceramic blocks set in resin between layers of conventional armor.
During Operation Desert Storm in 1991, no M1 tanks were lost to enemy fire directly but three were left behind enemy lines and destroyed by their own crews to prevent capture. A total of 23 M1A1s were damaged or destroyed throughout the war with seven lost to friendly fire and two intentionally destroyed.
Ukraine received 31 M1A2 variants beginning September 2023 as part of a larger aid package announced by President Joe Biden in January 2023. By April 2024, Pentagon officials stated Ukrainian Abrams had been withdrawn from frontline service due to hunter killer drones making operations too difficult.