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and it remained available through 1970. | and it remained available through 1970. | ||
The military version is known as the '''AM-1841/USM''', | The military version is known as the '''AM-1841/USM''', which is the same as a 53/54B MOD601. | ||
[[K]], [[L]], and [[T]] are tied for longest production life, at 16 years. | [[K]], [[L]], and [[T]] are tied for longest production life, at 16 years. | ||