Star wars battlefront 2 how do you obtain demolition

to unlock the demolition award and the seeker rocket launcher you can in the main menu click on career and click on the demolition score and it tells you at the bottom of the screen you have to score five critical hits on vehicles to unlock, to find out where the critical git points are watch this video:

http://www.youtube.com/watch?v=tjVZ0DaRqAU

i hope this helped.