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For historical information, Wikipedia has an article on T34 Calliope.
Sherman Calliope
M4 A3 Sherman Calliope new.jpg
Role Mobile rocket artillery, Tank
Operators United States
No. of positions 3
Position 1 Driver
75mm gun
7.62mm machine gun
Position 2 multiple rocket launcher
Position 3 7.62mm machine gun

Sherman Calliope is an American medium tank fitted with a multiple rocket launcher.


Officially called Rocket Launcher, T34 (Calliope) in US Army nomenclature, the Sherman Calliope in BattleGroup42 is a M4A3 Sherman with sixty rocket launch tubes mounted over the gun turret, giving the tank the ability to fire a powerful barrage of rockets while retaining its role as a medium tank.

The rockets are controlled by the crewman in the second position, which can be elevated or depressed but have extremely limited traverse range. Therefore coordination with the driver is important to bring out the vehicle's full potential.