to be destroyed intentionally by allied forces. By July 2010, thirty-eight Predators and Reapers had been lost during combat operations in Afghanistan and Iraq, another nine were lost in training missions in the U.S. In 2010, the USAF conducted over 33,000 close air support missions, a more-than-20 percent increase compared with 2009. By March 2011, the USAF had 48 Predator and Reaper combat air patrols flying in Iraq and Afghanistan compared with 18 in 2007. As of March 2011, the USAF was training more pilots for advanced unmanned aerial vehicles than for any other single weapons system. In 2012, the Reaper, Predator and Global Hawk were described as "... the most accident-prone aircraft in the Air Force fleet." In October 2011, the USAF began operating Reapers out of Arba Minch Airport in Ethiopia for surveillance-only operations in Somalia. In 2012, both Reapers and Predators were deployed in Benghazi, Libya after the attack that killed the US ambassador in that city. In February 2013, the U.S. stationed a Predator at Niamey to provide intelligence for French forces during Operation Serval in Mali; it was later replaced by two MQ-9 Reapers. In April 2013, one of these Reapers crashed on a surveillance flight due to mechanical failure. On 22 October 2013, the USAF's fleets of MQ-1 Predator and MQ-9 Reaper UAVs reached 2,000,000 flight hours. The RPA program began in the mid-1990s, taking 16 years for them to reach 1 million flight hours; the 2 million hour mark was reached just two and a half years later. The high demand for UAVs has caused Air Combat Command to increase pilot output from 188 in 2015 to 300 in 2017 at Holloman. On 13 November 2015, the Pentagon reported that an MQ-9 had killed ISIL member Mohammed Emwazi, popularly known as "Jihadi John", who was responsible for executing several Western prisoners. In 2015, a record number (20) of USAF drones crashed; investigators identified three parts of the starter-generator that were susceptible to breakdowns, but could not determine why they were failing. Col. William S. Leister informed Pentagon officials that investigators from the USAF, General Atomics and Skurka had investigated the problem for more than a year. The team, he said, had identified "numerous manufacturing quality issues" yet had been unable to determine the exact cause of the failures. On 2 October 2017, U.S. Central Command stated that an MQ-9 had been shot down