Found this site with some info:
http://planecrashinfo.com/cgi-bin/ps...1=michigan=and
- ACCIDENT DETAILS
Date: July 26, 1975
Time: 20:30
Location: Imlay City, Michigan
Operator: Military - U.S. Air Force
Flight #: ?
Route: Exercise
AC Type: Lockheed C-130A Hercules
Registration: 57-0454
cn / ln: 3161
Aboard: 6 (passengers:0 crew:6)
Fatalities: 6 (passengers:0 crew:6)
Ground: 0
Summary: Crashed while flying low in an exercise in formation. Propeller separation.