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)

A participant of the Wild Sau Dirt Run 2015 passes a mud barrier in Obertriesting, Lower Austria, Austria, Saturday, April 4, 2015. The Wild Sau Dirt Run is a cross country and steeplechase race for men and women over the distances of 5, 10 and 20 kilometers (3.1, 6.2 and 12.4 miles). (Photo by Ronald Zak/AP Photo)

Baby clouded leopards, born early in March 2015, are presented by zoo keepers at the Olmense Zoo in Olmen, Belgium, April 16, 2015. The clouded leopard is an endangered species with only some 10,000 specimen remaining on earth, said Robby Van der Velden, a biologist at the Olmense Zoo. (Photo by Yves Herman/Reuters)

A cultural dance group waits to perform at Gambela stadium during Ethiopia's Nations and Nationalities Festival in Gambela town, in Ethiopia December 8, 2015. Picture taken December 8, 2015. (Photo by Tiksa Negeri/Reuters)

English singer, songwriter, and actress Paloma Faith looks stunning as the new face of Agent Provocateur on September 8, 2015. The 34-year-old singer models the latest Famous Knickers Forever AW 2015 collection. Paloma once worked at the lingerie store's Soho branch in London. (Photo by Alice Hawkins/Splash News and Pictures)

A model presents makeup creations during dress reharsal by Maybelline New York at the Berlin Fashion Week Autumn/Winter 2015 in Berlin January 19, 2015. (Photo by Fabrizio Bensch/Reuters)

A model presents a creation by German designer Karl Lagerfeld as part of his Haute Couture Spring Summer 2015 fashion show for French fashion house Chanel in Paris January 27, 2015. (Photo by Gonzalo Fuentes/Reuters)

An aircraft passes over houses at it lands at Heathrow Airport near London, Britain, December 11, 2015. Picture taken December 11, 2015. (Photo by Neil Hall/Reuters)