Slitherine

I notice the game counts an SE 'reward' (e.g., the Bf109 from Cassino) as one of the five possible total SE units for the campaign. I thought that I recalled in AK the reward SE units came on top of the basic allotment. Thus, they were a true 'reward' and not just an early filling of a spot you would otherwise eventually get. Or perhaps I'm mis-remembering how it worked in AK, or it's intended differently in the West campaign?