A money changer sits behind piles of banknotes in Hargeisa in Somaliland, an autonomous, relatively peaceful region in northern Somalia. The self-declared nation of Somaliland, like Somalia itself, lacks a formal banking system, and residents rely on hawaladars to receive money from abroad. Simon Maina/AFP/Getty Images hide caption
Chief Warrant Officer Michael Durant, wounded when the helicopter he was piloting was shot down in Somalia, arrives at Andrews Air Force Base in Maryland, on Oct. 16, 1993. He was held captive for 11 days. Joe Marquette/AP hide caption
Westgate Mall in Nairobi after the deadly assault by Islamist gunmen on September 21, 2013. AFP/AFP/Getty Images hide caption
This image from the FBI website shows Abu Anas al-Libi, who was captured in a U.S. operation on Saturday in Libya. AP hide caption
Heavy smoke rises from the Westgate Mall in Nairobi, Kenya, on Monday. The Somali militant group al-Shabab claimed responsibility for the attack. Jerome Delay/AP hide caption
Somali women and children wait to get medicine in July 2008, from a clinic run by Doctors Without Borders about 20 miles south of Mogadishu. AFP/AFP/Getty Images hide caption
Ali Maow Maalin said he avoided getting the smallpox vaccine as a young man because he was afraid of needles. He didn't want others to make the same mistake with polio. Courtesy of the World Health Organization hide caption
A Yemeni child receives a polio vaccine in the capital city of Sanaa. The Yemen government launched an immunization campaign last month in response to the polio outbreak in neighboring Somalia. Mohammed Huwais/AFP/Getty Images hide caption
Health workers vaccinate a boy against polio at a May immunization drive in Mogadishu, Somalia. Farah Abdi Warsameh/AP hide caption
An undated screen image of footage shot by Al-Kataib Media, showing Denis Allex, a French hostage allegedly held by Somali militants, who was reportedly killed during the failed rescue mission. MAXPPP/EPA /LANDOV hide caption
In October, kidnapped French intelligence agent Denis Allex appeared in a video shot by his captors. In the video, Allex pleads for French President Francois Hollande to negotiate for his release. -/AFP/Getty Images hide caption