3. T34 Calliope
The T34 Calliope was a tank-mounted multiple rocket launcher used by the United States Army during World War II. Developed in 1943, it was mounted atop the M4 Sherman tank and fired a barrage of 4.5-inch (114 mm) M8 rockets from 60 launch tubes. While it saw limited combat use, its design influenced future multiple rocket launch systems. More details are available at Smithsonian Magazine.
