KABUL, Afghanistan — Two wounded American soldiers and the body of a third have been evacuated from a battlefield in southern Afghanistan after hours of clashes, a U.S. military official said Wednesday.

“All casualties have been evacuated” following fighting the day before near the city of Marjah, in the southern Helmand province, U.S. Army Col. Mike Lawhorn said. The evacuation was delayed Tuesday when one helicopter took fire and was unable to land, and another was unable to take off.

The U.S. and NATO formally concluded their combat mission a year ago, shifting to a training and advisory role. But U.S. troops are still authorized to carry out counterterrorism raids and combat missions to defend themselves.

CBS Radio News correspondent Cami McCormick says U.S. Special Operations forces have been helping their Afghan counterparts go after Taliban militants in Helmand Province — the group’s stronghold — where there has been a worrying resurgence of the extremist group.

While the U.S. military continues to insist that the American troops on the ground in Afghanistan are there only in a train, advise and assist role, McCormick says the casualties this week show how dangerous the battlefield in Helmand has become.

Gen. John Campbell, the U.S. commander of the joint “Resolute Support” mission in Afghanistan, told McCormick on a recent visit to Afghanistan that it has been a tough fighting season for the Afghan forces. The militants appear to be sending a message that as the U.S. moves out, they will make every effort to move in and take back ground.

The Pentagon is concerned about the Taliban’s resurgence — particularly as America is due to further decrease its troop presence this year.

The Taliban have recently attacked a number of cities in Helmand, one of several fronts where the insurgents have advanced in the past year.