British Prime Minister David Cameron (right) speaks with U.S. Army General John F. Campbell, International Security Assistance Force commander, during a round table discussion at Kabul International Airport Oct. 3, 2014. Since conflicts began in 2001, British troops have been a vital part of the NATO mission, destroying safe havens terrorist groups use to prepare attacks. “An Afghanistan free from al-Qaida is in our national interest as well as Afghanistan’s,” Cameron said. “Now, 13 long years later, Afghanistan can, and must, deliver its own security.”