In a global counterespionage case, FCA, working with the CIA, the FBI, Germany, and several foreign governments, successfully concluded the Clyde Lee Conrad espionage investigation, which involved the arrests and/or exposing of eleven participants in a spy ring that had been stealing war plans in Europe and selling them to the Czechs and the Hungarians, who provided them to the Soviet Union.
[8] In June 1992, after giving up command of FCA, Herrington established "Task Force Russia: POW/MIA" at the request of the Chief of Staff, Army, which supported an intensive probe into the fates of unaccounted for personnel from WW II, Korea, Cold War shootdowns, and Vietnam POW/MIA.
[11] In March 2002, he was requested by HQ, Department of the Army, to travel to Guantanamo, Cuba, to evaluate the interrogation operations of the reestablished Joint Task Force 160 of detainees seized during the United States invasion of Afghanistan and since.
His report to the Task Force commander strongly recommended the adoption of sophisticated, developmental-based operations along the lines of earlier successful projects Herrington had undertaken in other contingencies.
In December 2003, he again was asked by the Army to serve as a consultant, this time by traveling to Baghdad, Iraq to evaluate both interrogation operations and the conduct of Combined Joint Task Force 7 with respect to the growing insurgency.
In 2004, he repeated this effort at Fort Lewis, Washington to the soldiers of the 502nd Military Intelligence Battalion, again rejecting brutality and stressing the effectiveness of legal, developmental-based interrogation practices.
An American Reports on Vietnam, 1973-1975, Presidio Press, 1983 (Sequel to Silence Was A Weapon, an account of the cease-fire period ending with the evacuation of Saigon based on the author's tour of duty between Aug 1973 and April 1975) Out of Print Stalking the Vietcong: Inside Operation Phoenix Presidio Press (trade paperback), 1997, A revised edition of Silence Was A Weapon containing formerly classified data not included in the original edition, out of print.
A Tale of Two Families: A Genealogical Memoir of the Herrington Family Hardbound, Angel Printing, 2009 (not commercially available) The Fight for the High Ground: The U.S. Army and Interrogation During Operation Iraqi Freedom, May 2003-April 2004 by Major Douglas A. Pryer, U.S. Army, CGSC Foundation Press, 2009, (Major Pryer's award-winning book, with a Foreword contributed by Colonel (retired) Stuart A. Herrington addressing the interrogation issues of the Bush Administration)