14 January 1951 11:40 - Jolon, California , USA -   Three rectangular objects with flat tops

14 January 1951 12:38 - Big Bear Lake, California, USA -   Private pilot Hillman, flying with three passengers, saw a 150 foot (or 40-50 foot) circular object at 30,000 feet, moving west towards Los Angeles. The three passengers also saw the object.

20 January 1951 21:26 - Sioux City, Iowa, USA -   Vinther / Bachmeier Case. A 150-foot object like a B-29 fuselage flew across the nose of an airliner, moved within seconds to fly parallel to it on either side for a few seconds at a time, then accelerated away in seconds. Official explanation: Aircraft.

21 January 1951 18:20 - Oakridge, Tennessee, USA -   Attempted Intercept of UFO Over AEC Plant

22 January 1951 11:00 - Holloman AFB, New Mexico, USA -   Bright star-like object seemingly next to the pear-shaped balloon. Explanation: Balloon.

24 January 1951 10:45 - Westover AFB, Massachusetts, USA -   Radar

26 January 1951 14:05 - Pacific -   An object was tracked by radar. One object was observed by radar for over 15 minutes. Explanation: Weather.

In February 1951 - Cape May, New Jersey, USA -   An object was tracked by radar. One object was observed by more than one male experienced witness on the ocean.

1 February 1951 17:10 - Johnson AFB, Japan -   Amber light make 3-4 360° turns to the right

10 February 1951 - Gander W 90, Labrador, Canada -   USN R5D Transport incident.

10 February 1951 - Gander, Newfoundland and Labrador, Canada -   Bethune Case.

15 February 1951 13:00 - Sea of Japan -   Radar tracking of unidentified target at 12,000 - 14,000 mph in Sea of Japan off coast of South Korea.

19 February 1951 07:20 - Kilimanjaro, Kenya -   Passengers saw stationary silvery elongated object

21 February 1951 Night - Sakhalin, Japan -   10 reports of same UFO. Explanation: Aircraft.

26 February 1951 - Sakhalin, Japan -   33 reports of same UFO. Explanation: Aircraft.

In March 1951 Around 2300 - Cape May Se125M, New Jersey, USA -   USS Dyess incident.

8 March 1951 08:40 - Pacific -   An object was tracked by radar. One object was observed by military witnesses for nine minutes. Explanation: Aircraft.

9 March 1951 - Tsushima Island, Japan -   Radar tracking of unidentified target at 3,350 mph

24 March 1951 05:55 - Holloman AFB, New Mexico, USA -   Project Twinkle photographed UFO

April and May 1951 - North Korea -   Multiple ground sightings, April and May 1951; east coast of Korea.

14 April 1951 13:22 - Yellow Sea -   Radar tracking of unidentified target at 3,755 mph.

In May 1951 - South Korea -   Multiple radar confirmation

1 July 1951 22:50 - Seoul, South Korea -   Several bright green spheres [fireballs?]. Ground radar confirmation. Explanation: Meteor.

14 July 1951 09:00 - White Sands, New Mexico, USA -   Tracking Station incident. Explanation: Meteor.

30 July 1951 05:14 - Selfridge AFB, Michigan, USA -  

8 August 1951 14:10 - Port Clinton, Ohio, USA -   20 feet dark cigar-shaped object flying at high speed

21 August 1951 12:05 - Sea of Japan -   Radar tracking of unidentified target

26 August 1951 08:28 - Larson AFB, Washington, USA -   Two radars tracked 900 mph unidentified target at 13,000 feet. Explanation: Malfunct.

September 1951 to November 1952 - -   Prominent East Coast AF Base

9 September 1951 18:50 - North Korea -   Radar tracking of multiple unidentified targets at 900 mph

10 September 1951 11:37 - Fort Monmouth, New Jersey, USA -   Silvery metallic disc-shaped 30-50-foot object intercepted by a T-33 after a supersonic object was tracked on radar. Official explanation: balloon.

11 September 1951 13:30 - Fort Monmouth, New Jersey, USA -   Radar. Explanation: Balloon.

13 September 1951 21:30 - Goose Bay, Newfoundland and Labrador, Canada -   Two GCA operators observed what appeared to be three targets on the PPI (Plan Position Indicator) scope.

14 September 1951 21:30 - Goose Bay Afb, Labrador, Canada -   Project Blue Book "unidentified" case. two blips on collision course, one turns on radio warning.

17 September 1951 - Northwest Territories, Canada -   An object was tracked by radar and sighted visually. An unidentified object was tracked by radar and sighted visually by military witnesses. Explanation: Aircraft.

17 September 1951 22:20 - Hudson Strait, Canada -   Radar interference which came from an unidentified aircraft

18 September 1951 - Empire, Michigan, USA -   Five radar tracks of 6,000 mph targets

18 September 1951 00:20 - Goose Bay, Labrador, Canada -   Several saucer-shaped objects during 20 minutes.

18 September 1951 04:35 - Wisconsin, USA -   Radar. Explanation: Mirage.

23 September 1951 07:00 - March AFB, California , USA -   Fighter Pilots incident.

23 September 1951 07:55 - March AFB, California, USA -   Four F-86 fighters sight and intercept , but cannot reach the altitude of an unidentified aircraft over southern California. Explanation: balloon.

In Fall 1951 Night - South Korea -   14 ship USN incident.

3 October 1951 21:27 - Kadena AFB, Okinawa, Japan -   Large, sausage-shaped blip on radar

7 October 1951 - Honshu, Japan -   Radar tracking of unidentified target at 420 mph

10 October 1951 06:30 - Minneapolis, Minnesota, USA -   General Mills/Navy personnel track fast UFOs for two days.

18 October 1951 02:33 - Tsingtao, China -   Long orange-red conical flame change to white-orange. Explanation: Aircraft.

21 October 1951 11:25 - Battle Creek, Michigan, USA -   Classic domed disc and a Navion aircraft. Explanation: Balloon.

21 October 1951 13:30 - North Truro, Massachusetts, USA -   Radar

18 November 1951 03:20 - Washinton, District Of Columbia, USA -   Object with several lights, follow the DC-4 for about 20 minutes

In 1952 - Raf High Street, East Anglia, UK -   2-3 radar operators pick up large blip that had just ascended vertically from ground. Moved 20 miles in 54 seconds, or 1350mph, then vanished by either dropping to sea level or rising very rapidly to high altitude