Eliminate Decepticons to pinpoint Sam's position: The first wave is a bunch of punks so have fun with that. After that, there are more choppers. The lock-on missiles get the job done easily. Bumblebee ...

Disrupt NEST comm arrays: This is the second array mission in the campaign, but the first required one. There are five arrays, which is a lot, but Grindor is obviously very mobile and very powerful.