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LINKCity Damage Status
The city damage status indicates the percentage of objects destroyed in a city complex, which then affects the resupply of personnel to the factories via trains.
Refinery Damage Status
The refinery damage status indicates the percentage of damage to a zone's fuel refineries, which then affects the resupply time of the field fuel structures.
Ammunition Factory Damage Status
The ammunition factory damage status indicates the percentage of damage to a zone's ammunition factories, which then affects the resupply time of the ordnance available at the fields.
Radar Factory Damage Status
The radar factory damage status indicates the percentage of damage to a zone's radar factories, which then affects the resupply time of radar at the fields.
Training Barracks Damage Status
The training barracks damage status indicates the percentage of damage to a zone's training barracks, which then affects the resupply time of bunkers and troops available at the fields.
Ack Factory Damage Status
The ack factory damage status indicates the percentage of damage to a zone's ack factories, which then affects the resupply time of field ack.
(Edit: Downtimes and more info can be found at the above HELP link)