Production
Production started on July 29, 1966, and it entered service in June 1967 with 1st Battalion, 63rd Armor Regiment at Fort Riley. In the end 1,662 M551s were built between 1966 and November 2, 1970. Total cost of the M551 program was $1.3 billion. The M81 gun had problems with cracks developing near the breech after repeated firing, a problem that was later tracked to the "key" on the missiles that ran in a slot cut into the barrel. Most field units were modified to help address the problem, but later the modified M81E1 was introduced with a shallower slot, along with a matching modification to the missile, that cured the problem. The gun also has been criticized for having too much recoil for the vehicle weight, the second and even third road wheels coming clear off the ground when the main gun fired. Some were experimentally fitted with conventional 76mm guns, but these never entered service.
Read more about this topic: M551 Sheridan
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—W. Somerset Maugham (1874–1965)
“Just as modern mass production requires the standardization of commodities, so the social process requires standardization of man, and this standardization is called equality.”
—Erich Fromm (1900–1980)