Mounted on a Sherman M4, the T34 rocket launcher had 60 tubes that fired a 4.5" rocket to a maximum effective range of 3,900 yards. The T34 was only made in small numbers and was assigned to the 2nd Armored division in France. A problem with the T34 was that the tubes started to break up after only 4 salvoes and tube life was only 15 - 20 salvoes. The rockets could be fired singley or in salvo. 

The Crocodile Comet.

This A34 Comet was converted into a “Crocodile” which was a name used for a Tank that had a mounted flame thrower. 

The Sherman and the Churchill both had Crocodile variants seen here: