actually the Israelis use what is called a RLEM (Rilfe-Launched
Entry Munitions) to basically create the breach in the door or
wall. This allows the flexibility to either breach from an
unexpected entry point or to divert attention to the alternate
entry point while entering from the main entry point.
The munition is made by Rafael Armament Development Authority in
Haifa, Israel and is called the Simon Door Broaching Rifle Grenade.
It was developed for and has been used by Israeli Special Forces
for the past seven years. It can create a breach from up to 20m
away.
What is interesting is that there a lot of technologies out there
trying to nullify the defender's advantages.
e.g. UWB scanner to look into rooms, UAV to reconnitor rooms
=)