The article that with photo of the Seal Team helicopters highlighted the story of Extorsion 17
>The costliest day in SEAL Team 6 history was Aug. 6, 2011, when a Chinook helicopter with the call sign Extortion 17 was shot down in Afghanistan, killing all 38 people on board, including 15 SEALs from Team 6’s Gold Squadron, two of the squadron’s bomb-disposal technicians, as well as regular SEALs, pilots and others.
https://www.nytimes.com/interactive/2015/05/27/world/inside-seal-team-six.html