U.S. Army soldiers take up a position during a patrol in Baghdad in 2007. The U.S. has been waging war nonstop for 15 years since the Sept. 11 attacks. Despite the protracted conflicts and disappointing results, U.S. involvement in multiple wars appears set to continue for years to come.
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A photo from 2011 shows buildings ravaged by fighting in Sirte, Libya. Islamic State militants have controlled the city since August 2015. The U.S. military has announced ongoing airstrikes against targets in Sirte.
Men carry a coffin during the arrival of migrants and refugees in the port of Messina following a rescue operation at sea by the Italian Coast Guard ship "Diciotti" on March 17 in Sicily. After several quiet weeks, March saw a pickup in the flow of migrants attempting to reach Italy via Libya, a route through which about 330,000 people have made it to Europe since the start of 2014.
Giovanni Isolino/AFP/Getty Images
Tunisian soldiers patrol the outskirts of Ben Guerdane, in southern Tunisia, on March 8. Islamic State extremists crossed over from nearby Libya on March 7. They were beaten back, but the episode raised concerns that Libya's chaos could spread to Tunisia.
Security officers and other people walk next to damaged cars at the site where a truck bomb exploded at a security training camp on Thursday in the northwestern coastal city of Zliten, Libya.
Delegates from the Libyan political dialogue participants raise their hands at the signing ceremony of the Libyan Political Agreement in Skhirat, Morocco, on Friday.
An excerpt from The Arab of the Future about growing up in Libya in the 1980s, where housing was free. But another family moved into the author's home while he and his family were away.
Courtesy of Henry Holt and Co.
Mohammed Ali Malek is seen at Catania's tribunal, on Friday. Italian prosecutors blamed the captain of a grossly overloaded fishing boat for a collision that capsized and sank his vessel off Libya, drowning hundreds of migrants.
In this photo made available Thursday, April 23, 2015, migrants crowd and inflatable dinghy as the Italian Coast Guard approaches them, off the Libyan coast, on Wednesday.
Alessandro Di Meo/AP
Personnel at work in the operations room of the Italian coast guard in Rome on Sunday during the coordination of relief efforts after a ship carrying hundreds of migrants capsizes off Libyan coast occurred in the Strait of Sicily.
Angelo Carconi /Landov