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Watch yourself, in the airspace above Pakistan. On board a heavily modified Black Hawk helicopter, U.S. Navy SEAL-M. Matt Pisanette,

grips his assault rifle and glances

through the window at the countryside hurtling pass below. Matt is one of a dozen, highly trained, and

heavily armed Navy SEALs squeezed onto the helicopter. Another 12 men are on board a second Blackhawk

flying through the darkness next to them in close formation. Matt has been a Navy SEAL for 12 years.

He served multiple tours in Iraq and Afghanistan, but this is his most important mission yet.

It's so critical that it's a secret even from the Pakistani government,

and the two helicopters are flying fast and low to avoid radar detection.

That makes for a bumpy ride, though, and Matt holds on tight to his safety harness as the helicopter shutters.

The pilot calls out that there's one minute to target, and Matt feels a spike of adrenaline surge through it.

He connects his special fast descent rope to the helicopter's iron T-bar.

The plan is for the helicopter to hover over the target, which is a compound surrounded by a 12-foot-high concrete wall.

Then the seals will repel out of the helicopter into the courtyard and storm the building.

Matt and his fellow seals have trained for this for months using almost exact replica of the compound.

But there was a flaw in their planning and it's about to jeopardize the entire mission.

As the helicopter moves into position over the target, it suffers a sudden loss of lift.

Matt's stomach lurches in his throat as the helicopter drops sharply.

The pilot fights to regain control, but the helicopter is losing altitude fast.

...