I was trying to figure out if Frank Bessac, Mackiernan's CIA partner survived the mission to Tibet in 1949:

I found the Book "Into Tibet" a fascinating Read about the First person to die in the line of duty for the CIA in Tibet. So, as I was reading what the AI said about "Into Tibet" I also wondered if Mackiernan's partner survived too. It turns out he was one of the survivors of this confrontation. So, Bessac was likely able to reveal all their research back to the U.S. Government. 

Bessac was one of the last Americans to actually meet the Dalai Lama before China's full invasion of Tibet. 

It is quite likely the Chinese would have killed Bessac just like they tried to kill the Dalai Lama as he left Tibet for India and was given Dharamshala as an area in India to live with Tibetan Refugees then. They still live there and more and more Tibetans when they can escape Tibet so they can practice their religion and not be killed or abused for practicing their religion by moving to India and especially Dharamshala, India where the Dalai Lama still lives with thousands of Tibetan Refugees. 

I visited Dharamshala with my family in January 1986 after being initiated with 500,000 other people by the Dalai Lama into the Kalachakra Tantra in December of 1985 in Bodhgaya, India.

Bodhgaya, India is where Guatama Buddha became enlightened about 500 years before Christ and preached "the Lam Rim" the middle path which reminds me a lot of "Moderation in all things" that the ancient Greeks practiced too. 

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Yes, Frank Bessac survived the CIA mission to Tibet

, which is detailed in the book Into Tibet. Bessac was one of the two survivors of the perilous 1949-1950 expedition led by Douglas Mackiernan, who was killed by Tibetan border guards along with two other members of the party. 

• Bessac's survival: While Mackiernan was killed, Bessac was further away when the shooting started. He waved a white flag and confronted the guards, eventually surviving the encounter.
• The mission's outcome: The expedition, intended to assess the political situation and support Tibetan resistance against the Chinese, ended in tragedy for Mackiernan but was a successful escape for Bessac and another survivor, Vasili Zvansov.
• Post-mission activities: Bessac continued his career as an anthropologist and was one of the last Americans to meet the Dalai Lama before China's invasion of Tibet. 

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For more information, you can read about the mission in the book Into Tibet: The CIA's First Atomic Spy and His Secret Expedition to Lhasa by Thomas Laird. You can also find articles about Bessac's life and experiences in the New York Times, The Telegraph, and The Wall Street Journal. 

• Into Tibet - Pahar – Mountains of Central Asia Digital Dataset

  Oct 28, 2020 — PREFACE. INTO TIBET TELLS the story of a secret American expedition to. Tibet in 1949 and 1950 that has never before b...

  

  Pahar – Mountains of Central Asia Digital Dataset

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Frank Bessac, Scholar and Adventurer, Dies at 88

Dec 25, 2010 — In late April 1950, as the party was setting up camp, a Tibetan military patrol approached and, mistaking the traveler...

The New York Times

Frank Bessac: An Odyssey Through Wartime China - WSJ

Dec 27, 2010 — But it was too late. Tibet was invaded by Chinese forces the next month. (He also befriended Heinrich Harrer, a German...

The Wall Street Journal