When does a unit become out of supply, does it need an out-of-supply marker, and when is it eliminated?

Question

Accepted Answer

A unit is out of supply as soon as it cannot trace supply (14.1.1). Out-of-supply markers are only reminders and do not decide the status. A unit is eliminated only if it is still out of supply in the Attrition Phase (14.3.5).

Paths of Glory

When does a unit become out of supply, does it need an out-of-supply marker, and when is it eliminated?