Sukhoi Su-2 from the left
Here we see a Sukhoi Su-2 from above and the left, showing the glazed cockpit and the flexibly mounted rear firing machine gun. The curved glazing above the gunner is a fixed part of the cockpit canopy, and not the top of a turret.
How to cite this article:
Rickard, J (21 December 2019), Sukhoi Su-2 from the left , http://www.historyofwar.org/Pictures/pictures_sukhoi_su_2_formation.html