1. DATE 10 May 1956 2. LOCATION unkown, Wisconsin later rpt, same obsrvr, Waupun 3. DATE-TIME GROUP Local _______________ GMT 11/0247Z 4. TYPE OF OBSERVATION Ground-Visual Ground-Radar Air-Visual Air-Intercept Radar 5. PHOTOS Yes No 6. SOURCE Prisoner 7. LENGTH OF OBSERVATION two minutes 8. NUMBER OF OBJECTS one 9. COURSE unknown 12. CONCLUSIONS Was Balloon Probably Balloon Possibly Balloon Was Aircraft Probably Aircraft Possibly Aircraft Was Astronomical Probably Astronomical Possibly Astronomical Other_____________ Insufficient Data for Evaluation Unknown 10. BRIEF SUMMARY OF SIGHTING One round object, the size of a baseball held at arm's length. Smooth flight path. At first believed to be aircraft. Object was red in color. 11. COMMENTS Due to even flight path, duration and color, it is the opinion of this headquarters that this sighting was possibly caused by the exhaust of jet aircraft.