Realistically in terms of Astartes formations, is a 20 man tactical squad a singular squad, or two squads combined together for the duration of an operation?
I'm going to start adding squad markings to all of my marines, and I'm unsure if it's 'acceptable' to have dudes from squad 'I' and 'II' in the same 20 man unit, or if I should give them all the same 'I' marking.