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ISIS-inspired terrorism is another story.
The threat may be real.
The new $5 billion subs are the epitome of expensive, silent and deadly.
He claims to have 173 kills to his name.
The tiny drones are designed to carry out secret missions.
The Islamic State is losing ground everywhere.
Where we're going, we don't need runways.
Don't worry, they've got more.
Decorated SEAL Rorke Denver opens up in his new book 'Worth Dying For.'