to unlock news chopper go to big tower in casino area and there iis a building next to it. it has a pool on it go behind the pool there is achopper scan it u have the news chopper. lvl 20 top lvl u unlock health regen at lvl 20. oh by the way im stuck on the get the allspark one he take no damage what is happening is it a glitch? now back to unlockable things to unlock attack copter complete hoover dam and some doors that were closed are open and there will be a big hole beside the road it is an entrace go in scan choppers and u have attack chopper (the jets are not scannable tho).peace van is on a little cliff use a heli to get there scan and u have peace van. recon chopper get to the allspark part and dont go in the mission get 4 threat and recon choppers will appear scan them and turn into one u will have full health and no threat. stealth choppers and police choppers are on a mission or at some pointu will gwt chased by a stealth chopper or two when u get high threat (i think) police chopper chase u all time after certain point in geme when u get 3 or 4 threat. i know this because im on the get the allspark from starscream part and i still get chased by police choppers.LOL. teh swat van is behind a building in tranquility that is in the place with the parked police cars. the building is at the back and the van is behind it. thats all for now might post more in answers bit later. c ya ppl!