After World War II , the by then - renamed U.S. Army Air Forces had no need for Mullet Key .
Mullet Key was a sold back to Pinellas County along with adjacent islands Sister Key , Hospital Key , Rattlesnake Key , and Scratch Key .
After World War II , the by then - renamed U.S. Army Air Forces had no need for Mullet Key and it was a sold back to Pinellas County along with adjacent islands Sister Key , Hospital Key , Rattlesnake Key , and Scratch Key .