Fear Nothing

Missy Peregrym (Maggie Bell) was pregnant with her second child during shooting of this season and was written out of the show during this episode in a way that allows her character to return at an undisclosed later date.

While certainly a dramatic and poignant reference by OA to witnessing the use of sarin gas in Mosel, Iraq, it just isn't possible. The inference is that he witnessed it while serving in the US Army. No sarin gas was used during that period. The last deployment of any chemical agent in Iraq was in 1991 against the Kurdish uprising and it was nowhere near Mosel. Also, OA is far too young to have witnessed even that event, even as a child as his family is from Egypt.