Breach and clear
This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages)(Learn how and when to remove this template message)
Breach and clear is the name for a common tactical room clearing method. It is used when capturing a room or area with guards, enemies, or hostile civilians near the entrances to the area. An explosive charge such as C4 or another similar device is placed over the door / entrance, then detonated. This allows free movement inside a heavily guarded area, as nearly all conventional locks would be destroyed by the explosion.
Breach and Clear can also be executed by opening a door first, then throwing an explosive similar to a grenade inside. This can be performed with a smoke grenade or a flashbang in order to incapacitate the enemy. This is often called smoke & clear, frag & clear, or flash (or bang) & clear.