More US Troops Possible in Syria, Defense Sec. Ash Carter Says

ABC News' Bob Woodruff spoke with Defense Secretary Ash Carter.

The White House last month announced that approximately 50 special operations forces would deploy to Syria despite the president's statements going back to 2013 that he would not commit American boots on the ground there.

Carter acknowledged the possibility there could be other such incidents.

"It wasn't [Wheeler's] mission to conduct the assault; it was his mission to support the assault. But when he saw the assault get into trouble, he sprang into action. Now that wasn't part of his mission statement, but it was a reflection of tremendous personal heroism on his part," Carter said. "We're sending them into a dangerous situation and it can develop into a combat situation as it did with Joshua Wheeler."