6 August 2011, seventeen U.S. Navy SEALs were killed when their CH-47 Chinook helicopter was shot down by an RPG fired by Taliban militants. The SEALs were en route to support U.S. Army Rangers who were taking fire while attempting to capture a senior Taliban leader in the Tangi Valley. Fifteen of the SEALs belonged to the Naval Special Warfare Development Group. Two others were SEALs assigned to a West Coast-based Naval Special Warfare unit. A total of 30 Americans and eight Afghans were killed in the crash, making it the single largest loss of U.S. lives in the Global War on Terrorism. On 16 August 2012, SEALs in Uruzgan Province conducted a joint operation into the Shah Wali Kot Valley where they suffered the loss of a Black Hawk helicopter when it was struck by an insurgent RPG, the crash killed 11 servicemen (seven US and four Afghan). In December 2012, SEALs from DEVGRU rescued a US doctor who had been kidnapped a few days earlier. However, during the operation the unit suffered a fatality, Petty Officer 1st Class Nicolas D. Checque. Senior Chief Edward Byers, was awarded the Medal of Honor for his actions during this mission. In May 2013, Rear Admiral Sean Pybus, commander of Navy Special Warfare stated that the unit would cut in half the number of SEAL platoons in Afghanistan by the end of 2013. Pybus also added that the unit is already "undergoing a transition back to its maritime roots" by placing more emphasis on sea-based missions after being involved in mostly landlocked missions since 2001. Iraq War Invasion For the 2003 invasion of Iraq, a squadron from DEVGRU operated as part of Task Force 20. Their role was to conduct heliborne direct action raids, particularly against HVTs. The Naval Special Operations Task Group was assigned to Operation Iraqi Freedom, and was built around a core of SEAL Teams 8 and 10, Polish GROM, Royal Marines from 40 and 42 Commando under the command of 3 Commando Brigade and attached US Psy Ops and civil affairs teams. The Naval Task Group was principally tasked with the capture of the port of Umm Qasr, Iraq's only deep-water port; the oil pipeline facilities of the Al-Faw Peninsula; and the two off-shore platforms the pipelines fed. Once these initial target sets were secured, the Task Group would support conventional forces in the south, conducting reconnaissance and