[Ricochet]

Distraction devices are good. Try using an alarm, or a strobe device might work. Thunder B grenades without BBs or anything could work, or an approved smoke bomb (no flame, non toxic). If you can see through the door, use an LMG to spray ricochet rounds into the room, and attack from another entry. Kill the power and use bright flash lights to blind them. Good old fashioned breech and clear works. Stack up outside the doorway, and come in hot two by two. You lose a couple of guys, but you'll own the room. Dissolve the enemies patience as well. If there is only one way in, post a guy outside quietly to out wait them. He can use the door jam on an angle as a pinch point. Depending on the shape of the room, and how many enemies are inside, you can pie the corner as well; have a guy stand on either side of the door way up against the wall, and slowly cross out in front of one another shooting rounds into the room ...just don't shoot your buddy as he crosses in front of you.

If you want to sacrifice a decoy, have someone streak through the room while blowing on a rape whistle ...I'll bet they are the only one that dies.