1. Any friendly land territory or sea zone will qualify as a legal retreat location if any attacking unit came from it.
a. This does not mean that the attacking unit had to originate from the land territory or sea zone.
b. An aircraft flying over a territory or a sea zone will qualify said territory to be a legal retreat location.
c. The retreat location need not have been friendly at the start of the turn. It just needs to be friendly at the time of the retreat.