The M60, a descendant of the M47 and M48 Patton tanks, was the first American tank to be given the designation "Main Battle Tank". The M60 series of tanks served the US from 1960 through 1991 before being replaced with the M1 Abrams tanks. Over 15,000 M60s were produced; with the M60A3 being the final production variant. The "TTS" suffix to the M60A3 model designation stands for "Tank Thermal Sight" for tanks fitted with the AN/VSG-2 thermal sight.
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