Afghan refugees wait to leave for Afghanistan, at the United Nations High Commissioner for Refugees registration center in Peshawar, Pakistan. Under the agency’s voluntary repatriation program, started in March 2002, about 2.78 million Afghans have gone back home, but there are more than 1.7 million still residing in Pakistan, a majority of whom have lived in this neighboring country for decades. (Arshad Arbab / EPA)