Pale, slightly anxious, too quick to laugh - you can pick out the novices as soon as you enter the briefing room.

But the softly spoken national security adviser might as well have walked into the briefing room carrying a big stick.

Prepare yourself in the aircraft hangar briefing room before stepping into the wind tunnel.

That must now be kept within the walls of the briefing room.

An identical hut served as their mess hall, and another as a briefing room.