Lionfish, which are native to the Pacific and Indian oceans, are now present in the Atlantic and the Caribbean, where they are devouring smaller fish that protect reefs. The Caribbean island of Bonaire is teaching divers how to catch the venomous fish. Sean Carberry/NPR hide caption

itoggle caption Sean Carberry/NPR

Four Americans injured in Iraq and Afghanistan visit Kabul as part of Operation Proper Exit, a program designed for wounded warriors. From left, they are Staff Sgt. Ben Dellinger, Capt. Casey Wolfe, Capt. John Urquhart (who is hidden) and Sgt. James "Eddie" Wright. Sean Carberry/NPR hide caption

itoggle caption Sean Carberry/NPR

U.S. Marines board a C-130 transport plane as they withdraw from Camp Leatherneck, their huge base in southern Afghanistan. This marked the biggest handover yet to the Afghan army, which is facing a tough fight with the Taliban in Helmand province and other parts of southern Afghanistan. Wakil Koshar/AFP/Getty Images hide caption

itoggle caption Wakil Koshar/AFP/Getty Images

Afghan presidential candidates Abdullah Abdullah, left, and Ashraf Ghani Ahmadzai shake hands after signing a power-sharing pact in Kabul Sunday. The first vote in the election was held in April; a runoff followed in June. Wakil Kohsar/AFP/Getty Images hide caption

itoggle caption Wakil Kohsar/AFP/Getty Images

An Afghan firefighter emerges from the smoke from a fire in a Kabul clothing market in 2012. The fire department is remarkably professional in a city where few institutions function. Mohammad Ismail/Reuters /Landov hide caption

itoggle caption Mohammad Ismail/Reuters /Landov

Many Afghans who have worked as interpreters with the U.S. and other Western governments are trying to get visas to leave. "Mohammad," an interpreter, joined two former British soldiers last year in that country to call on Britain to grant Afghan interpreters asylum. Kirsty Wigglesworth/AP hide caption

itoggle caption Kirsty Wigglesworth/AP