1. You need the MAV on your recon class.
2. Place MAV facing the tower where it will clear the platform when rising straight up.
3. Hit circle (PS3) or X (XBOX360) to exit out of the MAV.
4. Jump on top, make sure your are centered, and lay prone.
5. Go back into the MAV controller and DO NOT TOUCH THE LEFT JOYSTICK.
6. Rise straight up without stopping and starting too much or you will fall off.
7. Once above the platform move the left joystick forward slightly until on top of the platform and then exit out of the MAV.
8. You should now be on top.