The following are UFO sighting cases that have been investigated by the Air Force Project Blue Book team and have been found to be unexplainable:   June 24, 1947: Mount Rainier, Washington at 3:00 PM.  Kenneth Arnold witnessed nine crescent-shaped objects that flashed among the mountain peaks "like saucers skipping on a pond."   June 24,1947: Cascade Mountains, Washington at 3:00 PM.  Fred Johnson saw a number of "disc-shaped" craft overhead and noticed that his compass was spinning wildly.   July 3, 1947: Harborside, Maine at 2:30 PM.  Astronomer John Cole, of South Brooksville, Maine, watched for 10 to 15 seconds while ten very light objects, with two dark forms to their left, moved like a swarm of bees toward the northwest.  A loud roar was also heard.   July 4, 1947: over Emmet, Idaho at 8:17 PM.  United Airlines Captain E.J. Smith, First Officer Ralph Stevens, and Stewardess Mary Morrow watched for 10 to 15 minutes while 4 objects with flat bottoms and rough tops moved at varying speeds, with one high and to the right of the others. July 6, 1947: Fairfield-Suisan Air Base, California.  Captain and Mrs. James Burniston watched for one minute while one object, having no wings or tail, rolled from side to side three times and then flew away very fast to the southeast.   July 7, 1947: Phoenix, Arizona.  William Rhodes watched a "heel-shaped" object that circled near his home.  He took two photographs of the object, which disappeared a few minutes later.   July 8, 1947: Muroc Air Base, California at 9:30 AM.  First Lieutenant Joseph McHenry, Technical Sergeant Ruvolo, Staff Sergeant Nauman, and Janette Scotte watched while two silver disc-shaped or spherical objects, apparently made of metal, flew a wide circular pattern.  One of them later flew a tighter circle.   July 9, 1947: Meridian, Idaho at 12:17.  Idaho Statesman, aviation editor, and former B-29 pilot Dave Johnson watched for more than ten seconds, from an Idaho Air National Guard AT-6, while a black disc, which stood out against the clouds, made a half-roll and then a stair-step climb.   July 10, 1947: Harmon Field, Newfoundland, Canada between 3:00 and 5:00 PM.  Three ground crewmen, including Mr. Leidy, of Pan American Airways, watched briefly while one translucent disc or wheel shaped object flew very fast, leaving a dark blue trail.  It then ascended and cut a path through the clouds.       July 29, 1947: Hamilton Air Base, California at 2:50 PM.  Assistant Base Operations Officer, Captain William Rhyerd and ex-AAF B-29 pilot, Ward Stewart watched while two round, shiny, white objects with an estimated 15 to 25 foot diameter, flew 3 or 4 times the apparent speed of a P-80, also in sight.  One object flew straight and level.  The other waved from side to side like an escort fighter.   September 3, 1947: Oswego, Oregon at 12:15 PM.  Mrs. Raymond Dupui watched as twelve to fifteen round, silver objects flew an unstated pattern.   October 1947: Dodgeville, Wisconsin.  An unidentified witness watched for one hour while an undescribed object flew circles.   October 14, 1947: Eleven miles N.N.E. of Cave Creek, Arizona at noon.  Fighter pilot, J.L. Clark, a civilian pilot named Anderson, and an unidentified third man watched for 45 to 60 seconds while one 3 foot flying wing-shaped object flew straight, from the northwest to the southeast.  It flew at an estimated speed of 380 miles per hour and at an altitude of between 8,000 to 10,000 feet.  It looked black against the white clouds and red against the blue sky.   April 5, 1948: Holloman Air Force Base, New Mexico in the afternoon.  Geophysics lab balloon observers Alsen, Johnson, and Chance saw two irregular, round, white or golden objects.  One made three loops then rose and disappeared rapidly.  The other flew in a fast arc to the west during the 30 second sighting.   July 24, 1948: Robins Air Force Base, Georgia at 1:50 AM.  Maintenance ground crewman Walter Massey saw a cigar-shaped craft that flashed overhead.  He thought that he saw a flame coming from the rear.   July 24, 1948: Near Montgomery, Alabama at 2:45 AM.  Eastern Airlines pilots Clarence Chiles and John Whitted watched a bright light head for their airliner and pass on the right.  The craft was cigar-shaped and had a double row of windows along it.  A flame shot out of the back.