7.2-Inch Demolition Rocket
The 7.2-Inch Demolition Rocket, also known as the T37, was a  rocket developed and used by the United States military during World War II. Derived from the "Mousetrap" anti-submarine rocket, it was intended for use in demolishing concrete bunkers and fortifications, and saw use from August 1944.

Development
The 7.2-Inch Demolition Rocket was developed by Section L of the National Defense Research Committee, located at Caltech, in late 1943 as a modification of the existing   ASW rocket (Mousetrap) for use against heavily fortified ground targets. Assigned to the United States Navy for development and production in July 1944, An additional high-explosive rocket, the T24, was planned, but was dropped in favor of the T37. The rockets utilized a standard  rocket motor, fitted with a larger-diameter warhead; a longer-ranged version utilizing a  motor was also produced.

Operational history
The T37 saw its first operational use during Operation Dragoon, the invasion of southern France, in August 1944, fired from 120-round "Woofus" launchers mounted aboard Landing Craft Rocket vessels offshore.

The rocket was also intended to be fired from tanks for the clearing of bunkers and anti-tank obstacles. The initial launcher, dubbed "Cowcatcher", was mounted on the front of M4 Sherman tanks; it was quickly found unsatisfactory, and was replaced by 20-round (T40 "Whiz Bang") and 24-round ("Grand Slam") launchers mounted atop the tank's turret. The 20-round launcher could fire its entire loadout of rockets in approximately 10 seconds; however the tank installation was unpopular with crews, as the launcher prevented the tank's turret hatches from being opened.

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Rocket weapons of the United States
World War II weapons of the United States
California Institute of Technology
Weapons and ammunition introduced in 1944