The U.S. Drug Enforcement Agency (DEA) is grieving over some of their own after three of their agents were killed during the deadliest month of the Afghanistan war, which also claimed the lives of 52 members of the U.S. military.

CBN News spoke with DEA Acting Administrator Michele Leonhart, who was present at Dover Air Force Base when the agent's bodies were returned.

She said she got an opportunity to not only talk with families of 52 U.S. Service members, but to welcome back those who served with the three slain DEA agents.

"They looked me in the eye and they all told me that they needed three things," Leonhart recalled. "They needed to be back here to see the families of the fallen agents. They needed to be back here to go see their families. And then they needed to return to Afghanistan to finish the mission."

According to Leonhart, Afghanistan is a major source of the world's heroin supply.

"As long as there are drug lords there funneling funds to terrorist organizations, and producing the type of drugs and quantity of drugs that they are producing, we'll be there," she vowed. "And we will need to be there until we have an Afghan national police and narcotics entity that are capable of taking that over."