The easiest way of capturing Command Post 2 is either by spawning as a Jet Trooper / Dark Trooper for the Republic / Empire , a hero (as it is easier due to the flight/sprint ability) or (not so easily) as another unit. With the jetpack equiped/hero/villian unit jet/jump into the street with the blocked end and then jet/jump onto the building on the right of you (when you face the blocked end). If you stand near the edge facing the command post you will be inside the radius without being in much danger. If you are playing as another unit go to command post 3 and stand on the roof from there you can sprint jump on to the buildings nearby. With some practice or luck you can reach the same rooftop as described earlier.