Don't know if you are aware. But on July 17, 1957 there was a training flight out of Forbes Air Force Base, Topeka, Kansas, on a composite mission that included gunnery exercises over the Texas-Gulf area, navigation exercises over the open Gulf, and finally ECM exercises scheduled for the return trip across the south-central United States.
They encountered a UFO over the Gulf of Mexico, just south of Gulfport, MS which followed them for 700 miles over a 90 minute span. More on the story here:
http://www.ufoevidence.org/cases/case665.htm My rendition.
