Don&#x27;t forget the Defiant, a WW2 fighter whose only armament consisted of a rearward-facing turret.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Boulton_Paul_Defiant" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Boulton_Paul_Defiant</a>