Afghanistan's interior ministry special forces demonstrate their skills during a military exercise in Kabul, Afghanistan, Thursday, April 2, 2015. Afghanistan's security forces took over full responsibility for the country's security on January 1, 2015. (Photo by Massoud Hossaini/AP Photo)

Afghanistan's interior ministry special forces take position during a military exercise in Kabul, Afghanistan, Thursday, April 2, 2015. (Photo by Massoud Hossaini/AP Photo)

Afghanistan's interior ministry special forces carry their wounded colleague during a military exercise in Kabul, Afghanistan, Thursday, April 2, 2015. (Photo by Massoud Hossaini/AP Photo)

Afghanistan's interior ministry special forces take near a building during a military exercise in Kabul, Afghanistan, Thursday, April 2, 2015. (Photo by Massoud Hossaini/AP Photo)

Afghanistan's interior ministry special forces demonstrate their skills during a military exercise in Kabul, Afghanistan, Thursday, April 2, 2015. (Photo by Massoud Hossaini/AP Photo)

Smoke rises after an explosion during a military exercise in Kabul, Afghanistan, Thursday, April 2, 2015. (Photo by Massoud Hossaini/AP Photo)

Afghanistan's interior ministry special forces take position during a military exercise in Kabul, Afghanistan, Thursday, April 2, 2015. (Photo by Massoud Hossaini/AP Photo)

Afghanistan's interior ministry special forces demonstrate their skills during a military exercise in Kabul, Afghanistan, Thursday, April 2, 2015. (Photo by Massoud Hossaini/AP Photo)

Afghanistan's interior ministry special forces carry their wounded colleague into an ambulance during a military exercise in Kabul, Afghanistan, Thursday, April 2, 2015. (Photo by Massoud Hossaini/AP Photo)

Afghanistan's interior ministry special forces take position during a military exercise in Kabul, Afghanistan, Thursday, April 2, 2015. (Photo by Massoud Hossaini/AP Photo)

Afghan men inspect the site of a suicide attack in Khost city, Afghanistan, Thursday, April 2, 2015. A suicide bomber attacked an anti-corruption demonstration in eastern Afghanistan on Thursday, killing more than a dozen people and wounding tens, an official said. (Photo by Nasim Liwal/AP Photo)