Welcome to the offices of Taskforce 29. Go to the North across from the elevator and take the stairs on up to the next level.
At the top of the stairs, you will meet Aria who is grateful to see him back at work after the bombing. She will give you the access codes for the shooting range.
Turn to the East and head along the hallway. Go for the doorway by the marker. The door will close before you can enter the room.
To get into the room with the target, turn to the right and head to the yellow framed crate at the end of the walkway past the Sector 11 door. Climb up onto the crate and open the vent covering on the vent.
In the vent, turn to the North, break through the two destructible vent covers. After the second, look to the right for the next vent cover. Drop down into the room.
Jump up onto the small ledge above the vent. Go to the hatch in the floor to the East. Drop into it and head over to the South. You can also head to the South without dropping into the hatch to reach the same place.
Go over to the interactive tower. Activate it to have the interior become exposed.