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In page M551 Sheridan:

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The 152 mm M81 gun-launcher that came to be used in the Sheridan was developed by Ford-Aeronutronic under a contract awarded by the Army in 1959.[2] The gun's primary purpose was to fire the Shillelagh missile,[citation needed] but it could also fire more conventional combustible case ammunition.[3] Two factors contributed to the selection of such a large-caliber gun. The Army desired a gun that would be capable of penetrating 150 mm of armor at 60 degrees, more than the 76 mm guns of the M41 or T92 were capable of. Secondly, the Shillelagh missile housed complicated electronics in addition to its warhead.[2] As a consequence of the pairing of a large caliber gun and relatively lightweight vehicle, only low-velocity rounds would be compatible with the gun.[4]