They will be running some drills on Lake St. Clair. From the Detroit Free Press today:
"People traveling near Lake St. Clair may notice a lot of commotion Wednesday.
The Michigan Air National Guard, U.S. Coast Guard, Macomb County Sheriff's Office and Harrison Township Fire Department will take part in an exercise to simulate what would happen if an F16 from Selfridge Air National Guard base crashed into the lake.
The activity, from 8 a.m. to 1 p.m., is designed to give first responders training to deal with possible crash scenarios."