In the Persian Gulf, Iran's drones pose rising threat to U.S.

ABOARD THE USS NIMITZ -- High above the Persian Gulf, an Iranian drone crosses the path of American fighter jets lining up to land on the USS Nimitz. The drone buzzes across the sky more than a mile above the massive aircraft carrier and is spotted by the fighters. But for the senior Navy commanders on the ship, the presence of the enemy drone so close is worrying. Their biggest fear is the surveillance aircraft will start carrying weapons, posing a more direct threat to U.S. vessels transiting one of the world's most significant strategic and economic international waterways. "It's just a matter of time before we see that," said Navy Rear Adm. Bill Byrne, commander of the carrier strike group that includes the Nimitz.