This is semi-easy if you have a team backing you up. Begin by heading up the stairs and placing the team on the landing so they can fire both at the floor level and the top of the roof. Head around the corner (to shield yourself from enemies shooting from the stairs) and fire a few rounds at the rappel point to draw enemies out. Raise up the tac-map (won't work in split screen) to make sure enemies do not appear in the distance at Building B. Your team should be able to guard your back while you hose the suckers coming down the rope.
In September 2018, the map was significantly reworked in the Operation Grim Sky expansion. This replaced the makeshift training facility with a more traditional brick structure. The original version of the map is now only available in Situations.
In this Situation, the Operator in question is an SASRecruit. The map is heavily modified to guide the player in the right direction. The player spawns in front of the left gate of the Shooting Range. All entrances to the range are fenced off, and another fence is placed to guide the player to the front entrance, in front of which a terrorist is standing. After entering, the main hallway is blocked by furniture, forcing the player to use the left two rooms to navigate. The bottom floor is also fenced off, and a wall in the further right room is reinforced to prevent players from entering there. At the top, there are two terrorists in the side rooms and three in the barricaded bedroom, the idea being that once the player kills the other two, those three will break out and rush the player. There are 11 enemies in total.
In this Situation, the Operator in question is Smoke. They are located downstairs in the Armory. The Hostage uses a unique model based on the Recruit. There are only three waves of terrorists as opposed to four, and there are no bombers. There are also fewer Terrorists per wave.