If you want to get this out of the way quickly, you can buy 10x the intel package for 5000 a piece. However, you will need to get 50 kills with airstrikes. The only way to acquire airstrikes is by ordering them from the HQ, so I would advise you not to focus too much on ordering things, unless you need them to complete the mission, or when you want to get some airstrike kills for that achievement.