my tactic that i found worked very well was to kep echo team alive (the team you support at the beggining)......
they will help you then from start to finish.
BEFORE going to the spot and meeting the pilots, clear out the entire village and destroy the 2 APC's that turn up (getting the bonus achievement in the process). Once everything is destroyed or killed, RV with the pilots and get them the hell out of their. You will meet some units on the way to the extraction but dont worry, a little bird will deal with them
