Breach and clear

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Breach and Clear is a tactical name for a common SWAT [US] maneuver. It is used when infiltrating a room or area with guards, enemies, or hostile civilians near the entrances to the area. An explosive charge [commonly C4[1] or another similar device] is placed over the door / entrance, then detonated. This allows free movement inside a heavily guarded area, as mostly all conventional locks would be incinerated by the explosion. Breach and Clear can also be executed by opening a door first, then lobbing 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, or Frag & Clear.