An enemy unit is never placed in a U.S. controlled sector. For example, if you roll a 2 and it is U.S. controlled, the enemy unit would be placed in 6-8 instead. Check the Battle Board for those numbers. U.S. control are removed by enemy action, Random Events , and actions by your tank. Reread 5.12 for more info.
I knew this rule...not sure why I forgot it (senior moment I guess)
thanks for the reminder