Rocket Launcher T34 (Calliope) – Version carrying 60 4.5 in (114 mm) rockets in arrangement of a group of 36 tubes on the top, and a pair jettisonable groups of 12 tubes (24 tubes of jettisonable groups) on the bottom (Not jettisonable from M4A1 Sherman variant).
 A large support beam bolted to the left and right turret cheeks supported the weapon placed 1 meter above the turret.
The rack was physically connected to the barrel of the M4’s 75mm gun using an arm.
This arm was connected to the rack via a pivoting joint and clamped to the gun with a split ring.
This allowed the missile launcher to follow the same elevation and depression arc of +25 to -12 Degrees.

Each rocket was armed with a 4.5 inch (114 mm) fin-stabilized projectile armed with High-Explosive, and had a maximum range of 4200 yards (4 km)
The range was increased to 5250 yards (5 km).
The rockets were fired electronically using cables that were inserted through the commander's hatch.
The 75mm main gun could not be fired once the rocket launcher has been attached.
This caused the tank crews to modify the launcher's installation in the field, thereby allowing the main gun to fire albeit at a reduced elevation for the launcher .

Rocket Launcher T34E1 (Calliope) – Same as T34 but groups of 12 jettisonable tubes replaced by groups of 14 tubes.

Rocket Launcher T34E2 (Calliope) – Caliber of rockets increased from 4.5 in (114 mm) to 7.2 in (183 mm), number of tubes remains at 60.
Saw combat in 1944–1945.
Rocket Launcher T34 (Calliope) – Version carrying 60 4.5 in (114 mm) rockets in arrangement of a group of 36 tubes on the top, and a pair jettisonable groups of 12 tubes (24 tubes of jettisonable groups) on the bottom (Not jettisonable from M4A1 Sherman variant).  A large support beam bolted to the left and right turret cheeks supported the weapon placed 1 meter above the turret. The rack was physically connected to the barrel of the M4’s 75mm gun using an arm. This arm was connected to the rack via a pivoting joint and clamped to the gun with a split ring. This allowed the missile launcher to follow the same elevation and depression arc of +25 to -12 Degrees.
Each rocket was armed with a 4.5 inch (114 mm) fin-stabilized projectile armed with High-Explosive, and had a maximum range of 4200 yards (4 km)
The range was increased to 5250 yards (5 km). The rockets were fired electronically using cables that were inserted through the commander's hatch. The 75mm main gun could not be fired once the rocket launcher has been attached. This caused the tank crews to modify the launcher's installation in the field, thereby allowing the main gun to fire albeit at a reduced elevation for the launcher . 
Rocket Launcher T34E1 (Calliope) – Same as T34 but groups of 12 jettisonable tubes replaced by groups of 14 tubes.
Rocket Launcher T34E2 (Calliope) – Caliber of rockets increased from 4.5 in (114 mm) to 7.2 in (183 mm), number of tubes remains at 60. Saw combat in 1944–1945.
T34 Calliope