How do I complete the Assignment DEATH FROM BELOW?

Solution 1:

This took me a while to unlock as I wasn't sure what it classed as "Attack Air Vehicles" but I'm now certain that this means scout heli, attack heli, stealth and attack jet, just not the transport chopper. You can use all rocket launcher, including Stinger and IGLA, however I used a combination of the SRAW and the Battle Pickup the HVM-II which is excellent for using against air vehicles.

Since the minor update you cannot carry AA Mines and a rocket launcher any more, so if you carry AA mines you are restricted to SLAMS, AT Mines, and the Repair Torch. No more Stinger and AA mine combo. This IMHO has nerfed their uselessness as I would take a SRAW anyday.