5 page Manuscript written and autograph signed by M.B. Ridgway, General, US Army 
Titled "Tough Talk to a Tough Russian" 
Exact date unknown
 
First Paragraph:
"It was during my service on the Military Staff Committee and the US Delegation to the Atomic Energy Committee of the UN that I was given additional duties in a field where I felt myself more qualified to serve. I was named as Chairman of the Inter-American Defense Board, the military agency within what then was called the Pan American Union, and which is now the Organization of American States."...
 
Letter mentions:
Act of Chapultepec 
Rio Pact
North Atlantic Treaty
Senator Vandenberg - who served as a United States Senator from Michigan from 1928 to 1951
Andrey Vishinsky - In March 1949 he became foreign minister and, representing the Soviet Union at the United Nations, frequently launched bitter verbal attacks on the United States, which was soon engaged in the Korean War. After Joseph Stalin’s death in 1953, Vyshinsky was demoted to first deputy foreign minister, but he remained at the UN as the permanent Soviet representative until his own death a year later.
 
From 1946 to 1948, he served as the United States Army representative on the military staff committee of the United Nations. 
The United Nations Atomic Energy Commission (UNAEC) was founded on 24 January 1946 by the very first resolution of the United Nations General Assembly "to deal with the problems raised by the discovery of atomic energy."
The Inter-American Defense Board (IADB) was created in 1942 by foreign ministers of 21 states, in the middle of World War II. It is now the oldest existing defense organization in the world.
In March 2006, the Organization of American States (OAS) assumed formal authority over the IADB. As of that date, 27 of the 34 members of OAS were also members of the IADB.