After the range, you will enter a 'maze'.
In the next area you get to use sub-machineguns. Continue on to the Pistol Shooting Range and practice shooting with the pistols. Go through the door marked Close Combat Training Ground, and practice using the wire and knives on the dummy. Climb down the ladder and drop to the recess, then climb up the ladder and exit through the door. Follow the catwalk around and automatically jump to the next section. Walk straight ahead to climb over the rail, then climb the nearby ladder. Go through the first door and change clothes.