American Pilot Killed During "Clear Sky 2018" Joint Exercises In Ukraine

https://www.zerohedge.com/news/2018-10-16/american-pilot-killed-during-clear-sky-2018-joint-exercises-ukraine

What? Co-piloting? Is this standard? "US Air National Guardsman who was killed Tuesday when the Ukranian Su-27UB fighter he was co-piloting crashed in a west-central Ukraine field"