Colorado Springs Colo Mexico unidentified aerial event — December 13, 1955

On or during December 13, 1955, at or near Colorado Springs Colo Mexico, Mexico, the source reports the following sequence: BRIEF SUMMARY OF SIGHTING: Obj observed to move rapidly toward direction E of flight and open end at rear. Flew a straight course, flat trajectory. The text appears to be a typed report from Project Blue Book, a United States Air Force program that investigated reports of unidentified flying objects (UFOs). PAGE TWO RJWPPG 121C (A) COMPARISON TO SIZE OF WHITE LIGHT. (H) NONE. (I) NONE. (A) COPILOT IN RIGHT SEAT NOTICED OBJECT APPROACHING HIGH FROM EAST. CALLED ATTENTION OF PILOT WHO ALSO OBSERVED OBJECT. (B) OBJECT APPEARED SIZE OF A SILVER DOLLAR AT ARMS LENGTH AND APPROACHED TO APPROXIMATELY 1500 MPH. (C) OBJECT OBSERVED HIGH OVERHEAD. (D) OBJECT FLEW A STRAIGHT COURSE, FLAT TRAJECTORY, HIGH OVERHEAD-SPEEDING DARK IN DAYLIGHT PASSING OBJECT CAME AND AT DISTANCE APPROACHED LIGHTER AREA TO WEST. (E) FIVE TO SIX SECONDS. (F) CAN'T ATTRIBUTE. (G) NONE (Q) SWJNR 449.2256 AT 18,000 HEADING 334 DEGREES, SPEED 224 K TRUE, ALTITUDE 18,000 FT WASH. (A) 1264862 (B) DUSK UNCLASSIFIED PAGE THREE RJWPFG 121G 5 DEC 52 C0N - 4O23 CAPT GARLAND L. NO AIRCRAFT OBSERVED