Eddie (Theo James) tells Collins (Max Beesley) that he served in the Queen's Dragoon Guards. Eddie was shown in his uniform in episode 1, which included a light blue beret. The beret of the Queen's Dragoon Guards is in fact navy blue, so this appears to be an error. However, Eddie was serving as part of a UN peacekeeping operation, and all UN peacekeepers wear light blue berets instead of their usual regimental colour.