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The US Army's primary MBTs (Main Battle Tanks) during and after the Vietnam War were the M60 Combat Tank and the M48 Patton tank; the latter of which was officially designated as a 90mm (medium) gun tank. The M60 MBT was fielded with a 105mm main gun.
The new M60 MBT, which was fielded in 1960, and the M48 Patton both used an optical coincidence range finder, for their cannons. After the war, in the mid 1970's, laser range finders began replacing the optical range finders in all US MBTs. By the late 70's, laser range finders were standard equipment.
Today's new synthetic armored & computerized new MBTs are as different from the Vietnam era tanks as a 1930's automobile is from today's talking and self driving cars (today's 21st century "smart cars").
A typical draftee could operate any Vietnam era US tank. Today's MBTs require the equivalent of a pilots check-off list from the operator's manual (TM -10 series) as soon as the crewman enters the hatch.
A Vietnam era US tank was a solid cast steel war machine with mechanical (no digital) instruments and gears, and cost about $300,000, if that. Today's MBTs exceed 1 million a copy, and are constructed with classified synthetic materials. Like today's jets and ships, they are crammed with computers and digital equipment.
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