Copper Flag was (is?) a predominantly EW oriented exercise held in the Gulf just off Florida pan handle. The Google search info looks correct and saves me a trip upstairs to dig out my logbook (thanks for the check
Think we were there a couple of weeks; memorable was the Air National Guard from New Orleans who heard about our visit, flew their own DC-7 (I think) down to Tyndall, flew us to N'orleans and hosted us magnificently for the weekend, including a table with more shrimps on it than there are in the North Sea.
I think there were some F4 trips to Some other flags a couple of years later, not sure we ever supported Copper Flag again except for this time.