Another E3 2015 trailer for Tom Clancy's Rainbow Six Siege shows off co-op gameplay from the upcoming tactical shooter, captured showing five players teaming up against the AI. Here's word from the UbiBlog:

We’ve told you all about the new TerroHunt in Rainbow Six Siege. We dug in on the little details like “What modes are part of it?” and “Who are we fighting this time?” But what is it like to actually play TerroHunt? Better yet, what’s it like to play TerroHunt on the hardest setting in the game? After spending a good chunk of time with TerroHunt on Normal, my team and I decided to give Realistic a shot in the newly revealed Consulate map and what followed was an adventure full of surprise Bombers, accidental team kills and seemingly impossible scenarios.