Room-Clearing Tactics: Three Methods, One Decision Tree
There are essentially three room-clearing methods, and the choice between them is rarely a 'preference' — it's dictated by what you know about the room, the threat, and the cost of being wrong.
Deliberate clearing
Slow. Slice as much as possible from the threshold. Enter only what's left unseen. The default for almost every situation that isn't time-critical.
Dynamic entry
Speed, surprise, violence of action. Used when surprise is already lost, or a hostage is on a clock. High risk, high reward.
Limited penetration
Clear the entire room without crossing the threshold. Possible for small rooms (closets, bathrooms) where the slice covers 100%.
How instructors actually choose
Deliberate is the default — full stop. Most professional teams default to it because the math is unforgiving: the one in the doorway is the one most likely to die. If slicing the room can answer the threat question, you don't enter. You only escalate to dynamic when you've lost surprise or time is critical.
What 'limited penetration' really buys you
If you can clear a room without entering it, you skip the fatal funnel entirely. Closets, bathrooms, narrow hallways with one open door — these are limited-penetration candidates. Recognize them and you save your team a needless threshold cross.
The decision tree
1) Can I clear it without entering? → Limited penetration. 2) Do I have time and surprise? → Deliberate, slice everything you can, enter the unseen slice with a cross or buttonhook. 3) Is the clock or the threat already in motion? → Dynamic, speed and aggression, accept the risk.
Drilling the choice, not just the entry
Most sim players over-rehearse the entry and under-rehearse the choice. TGH's CQB nights deliberately mix room types so the lead man has to *pick* the method on the fly, then the team debriefs whether the pick was right.
Common questions
Is dynamic entry the 'cool' option?
It looks cool. It also kills the lead man more often. Use it when the situation actually demands it, not because it feels operator.
How many people minimum?
Two. A solo room clear is acceptable in extremis but always inferior. Two-man with cross or buttonhook is the practical minimum.
Where do I practice picking the method, not just executing?
TGH's Ready or Not drill nights — the maps force constant method-choice decisions, and the team calls them out so you learn to read rooms faster.