The fire service says several roads are closed while crews tackle the blaze.
The Gloucestershire base is being used by the United States Air Force to launch operations against Iran.
Nine fire engines were sent to the scene to extinguish the blaze.
After several serious house fires, people are given advice in the hope of preventing future blazes.
The agreement comes after two days of “intensive” negotiations during the summer months.
The park is home to England's only group of King Penguins and dried up during the heatwave.
Inspectors say Gloucestershire Fire and Rescue Service has made improvements in several areas.
An ambulance service is hoping the swap improves response times and saves £300,000 a year.
The man, 23, got into difficulty after entering the water at Buscot Lock, police say.
