ORIGINAL: jlbhung
I think units in bright green means they are both within 5 hexes of it Corps HQ and 12 hexes of its Army HQ. Those in dark green are within 5 hexes of Corps HQ but more than 12 hexes from the Army HQ. You may count the number of hexes to verify.
This is incorrect. It should be 5 and 15 hexes, based on command range listed in chapter 21.11.4.
"The different types of HQs each have a different range over
which they can supply leadership modifications and assign
support squads.
High Command – 90 hexes
Army Group/Front – 45 hexes
Army – 15 hexes
Corps/Soviet Army after July 1941 – 5 hexes
Air Command – 90 hexes (note that if an air command is
within 90 hexes the modification for range (15.5.4) will not
take place and the air base will be treated as being 0 hexes
from the HQ)."
Also, you are wrong about the colors.
"Units that are in command range of their
immediate HQ and report to the level of HQ that is
expected (so an Army for the Soviets and Corps for the
Axis) are shown in green. If in turn that HQ is in range of its
next HQ in the chain this becomes a dark green."
It says "green" but I assume it means bright green since dark green is defined after. However, in the section on supply priority 36.5.3, "bright green" is the best and dark green is the second best. So I'm unsure if the manual is incorrect for command efficiency. And if the manual isn't incorrect, I recommend they change it so it's not confusing when switching between maps modes (i.e one colors should be used consistently).