Military Operation Mainbrace UFO Triangle Sighting of 1952

On September 14 1952 NATO Exercise Mainbrace begins in the North Sea. It is the first large-scale naval exercise undertaken by NATO and jointly commanded by Admiral Lynde D. McCormick and Gen. Matthew B. Ridgway. 

It involves the US Navy and the navies of Great Britain, France, Canada, Denmark, Norway, Portugal, Netherlands, and Belgium. Its objective is to convince Denmark and Norway that they can be defended against an attack from the USSR, and involves 80,000 men, 200 ships, and 1,000 aircraft. 

The operation lasts through September 25. At 10:13 p.m. The Danish destroyer Willemoes, during the Exercise Mainbrace maneuvers, is north of Bornholm island, Denmark, in the Baltic Sea. Lt.Cmdr. G. Schmidt-Jensen and several members of the crew see an unidentified object "UFO", triangular in shape, that moves at high speed toward the southeast. 

It emits a greenish glow and jets three rays of fire from its rear. Jensen estimates the speed at 930 mph. 

Now We Look At The Massive Unusual Project High Jump 1946

Sources:

"Danish Official Sees Mysterious Object In Sky," Bristol (Tenn.) Herald Courier, September 15, 1952, p. 1;

"Glowing Object Seen Over Bernholm Island," Atlantic City (N.J.) Press, September 15, 1952, p. 1;

Brad Sparks, Blue Books Unknowns Catalogue, Case 823, p. 173; 

Edward Ruppelt, The Report on Unidentified Flying Objects, pp. 195-196;

Loren E. Gross, UFOs, a History: 1952, September October, The Author, 1986, p. 28; 

Loren E. Gross, UFOs, a History: 1952, September October, Supplemental Notes, The Author, 1986, p. 29; 

Richard Hall, The UFO Evidence, pp. 162-163;

David Marler, Triangular UFOs: An Estimate of the Situation, pp. 128–129, 265;

Wikipedia, “Exercise Mainbrace”

https://en.wikipedia.org/wiki/Exercise_Mainbrace

NICAP, “Operation Mainbrace Sightings”; 

http://www.nicap.org/reports/5209XXmainbrace_report.htm

NICAP, “Three Objects In Formation At High Speed During Mainbrace”;

http://www.nicap.org/520914NAtlantic_dir.htm

WILLEMOES (1947-1966)

https://www.navalhistory.dk/.../VW/Willemoes(1947).htm