Finnish military unit practice tactical treatment of combat injuries during a co-operation between Finnish and Swedish troops at Tofta shooting field on the Swedish island Gotland on September 19, 2017 during the ongoing military exercise Aurora 17.

Sweden kicks off with Aurora 17 its first and largest defence exercise in 20 years on the island of Gotland in the Baltic Sea. / AFP PHOTO / TT NEWS AGENCY / Anders WIKLUND / Sweden OUT        (Photo credit should read ANDERS WIKLUND/AFP/Getty Images)