Shortly after eleven o’clock on the night of May 1st, two MH-60 Black Hawk helicopters lifted off from Jalalabad Air Field, in eastern Afghanistan, and embarked on a covert mission into Pakistan to kill Osama bin Laden. Inside the aircraft were twenty-three Navy SEALs from Team Six, which is officially known as the Naval Special Warfare Development Group, or DEVGRU. A Pakistani-American translator, whom I will call Ahmed, and a dog named Cairo—a Belgian Malinois—were also aboard. It was a moonless evening, and the helicopters’ pilots, wearing night-vision goggles, flew without lights over mountains that straddle the border with Pakistan. Radio communications were kept to a minimum, and an eerie calm settled inside the aircraft.

Fifteen minutes later, the helicopters ducked into an alpine valley and slipped, undetected, into Pakistani airspace. For more than sixty years, Pakistan’s military has maintained a state of high alert against its eastern neighbor, India. Because of this obsession, Pakistan’s “principal air defenses are all pointing east,” Shuja Nawaz, an expert on the Pakistani Army and the author of “Crossed Swords: Pakistan, Its Army, and the Wars Within,” told me. Senior defense and Administration officials concur with this assessment, but a Pakistani senior military official, whom I reached at his office, in Rawalpindi, disagreed. “No one leaves their borders unattended,” he said. Though he declined to elaborate on the location or orientation of Pakistan’s radars—“It’s not where the radars are or aren’t”—he said that the American infiltration was the result of “technological gaps we have vis-à-vis the U.S.” The Black Hawks, each of which had two pilots and a crewman from the 160th Special Operations Aviation Regiment, or the Night Stalkers, had been modified to mask heat, noise, and movement; the copters’ exteriors had sharp, flat angles and were covered with radar-dampening “skin.”

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