At the airport’s southern and eastern gates, trucks were blocking both approaches diagonally and Taliban guards were positioned a few hundred yards away. At both locations, Taliban guards told a reporter that no one was allowed to go near the airport and that all entrance gates were closed.

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Just three months after the killing of Osama bin Laden, the U.S. military endured its biggest single-day loss of life during its two-decade war in Afghanistan. On Aug. 6, 2011, insurgents shot down a transport helicopter, killing 30 Americans and eight Afghans.

The Taliban, who claimed responsibility for the attack, had found an elite target: U.S. officials said that 22 of the dead were Navy Seal commandos, including members of Seal Team 6. Other commandos from that team had conducted the raid in Abbottabad, Pakistan, that killed Bin Laden in May of that year.

The helicopter, on a night-raid mission in the Tangi Valley of Wardak Province, to the west of Kabul, was most likely brought down by a rocket-propelled grenade, an official said then. It was the second helicopter to be shot down by insurgents within two weeks.