Mission Story Ideas?

HELP!!! I've been stuck in writer's block for a 년 now...

I'm on my fourth book in the series and got stuck trying to come up with black-op missions for my military characters.
Here's some details, they're a group of 5, deployed in South America, they're a ghost group, basically considered dead to the outside world.

Before 당신 guys try to suggest stuff to help with writers block, trust me I've done it all. I just need some ideas to jump start my brain again. Thanks in advance!