The Pentagon says the two Americans killed in Afghanistan in an apparent insider attack by Afghan soldiers were Air Force special operations troops.

They are identified as 27-year-old Capt. Matthew D. Roland of Lexington, Kentucky, and 31-year-odl Staff Sgt. Forrest B. Sibley of Pensacola, Florida.

Roland was assigned to the 23rd Special Tactics Squadron based at Hurlburt Field, Florida, and Sibley was assigned to the 21st Special Tactics Squadron based at Pope Army Airfield, North Carolina.

Hurlburt Field is home to the Air Force Special Operations Command.

The attack was carried out Wednesday at a military base in southern Afghanistan's Helmand province. Early reports said three other Americans were wounded.

The attackers were wounded in an exchange of gunfire but survived.