There are several effects of being 'Out of Command'.
I can't find a rule that defines when specifically being in or out of command is tested. Perhaps someone can point me to the right page if I have missed it? I have being playing that if a unit is in command at the start of the 'Activity Phase' then it is 'In Command' for the rest of the phase. But is this correct?
If you test for being 'In Command' at the point of making an action that might be affected then this has different consequences.
This is important for artillery. They might be 'In Command' at the start of moving. However, when they have finished moving and wish to unlimber they may have moved 'Out of Command'. Therefore if the test is applied then, they would be unable to unlimber, as artillery must be 'In Command' to unlimber. As commanders move last in the phase for each group it would take an extra turn before the artillery could unlimber.
This extra turn delay makes a significant difference to how the game would play. Which is correct?