Afghanistan ? The Defense Department has identified the nine American troops killed in the worst coalition helicopter crash in Afghanistan in four years.

The military announced Wednesday that four sailors were killed in the crash during combat operations a day earlier, along with five soldiers. Three of the sailors were Navy SEALs, while the fourth was assigned to the Naval Special Warfare unit. The five soldiers were from the 101st Combat Aviation Brigade, 101st Airborne Division, at Fort Campbell, Ky.