Судя по всему, Чинук таки был сбит, хотя в явном виде напрямую это не говорится:

In the most lethal of the two crashes, seven American servicemen and three agents with the United States Drug Enforcement Administration died when their Chinook twin-rotor helicopter crashed in western Afghanistan after a firefight with Taliban insurgents. Twenty-six people were injured: 11 American servicemen, one American civilian and 14 Afghan soldiers.

The crash followed a gun battle with insurgents that broke out when the Americans and Afghans raided a compound believed to harbor drug traffickers. The Americans and the Afghans killed more than a dozen fighters, military officials in Kabul said. The Chinook crashed as the American and Afghan forces were leaving.
14 Americans Die in Afghan Helicopter Crashes

Вкратце - катастрофа последовала за боевым столкновением с повстанцами, бла-бла-бла...