I would suggest something that used the symbols on the rulebook. The symbols would be circular rather than rectangular.
UNIT TYPES
green + eye = Recon
red + spears = MARS
blue + microscope = Science
and add
gold + initials of specialist type = Specialty
Combined units would look a little like "pie charts". For example, the symbol for a MARS/RECON team would be a circle - half-filled in green and half-filled in red
UNIT SIZE
Team (less than 20) = no additional marking
Group (20 to 50) = 1 additional concentric ring
Area Group (50 to 150) = 2 additional concentric rings
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