When I make my dioramas's I have the certain idea down and I stick with that, down along the road ill probally think of something and small details might change, but it wont be anything major, just small things. Then near completion I get idea's for names although im not good at it myself.
Just a Question, were is your dio set? If it suits the figures and its something like the Ardenne, is the ammo crew from Tamiya, those ones are in fatigues, the uniforms aernt very thick for the ardenne, more like normandy. (?) I think dragon does a set of an ammo loading crew in the thick smocks and parka's like in the ardenne: