Gregg's father was Abel J. Gregg of Washington, the national secretary of boys' work of the Young Men's Christian Association.
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In September 2009, Gregg retired to the role of chairman emeritus of The Korea Society and was replaced as chairman by Thomas C. Hubbard.
In 1970, after the U.S. Bureau of Narcotics' "Operation Eagle" busted a drug-running scheme, several of the Cuban-Americans involved in the Bay of Pigs Invasion came to work for Shackley and Donald Gregg in Vietnam, including Felix Rodriguez.
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