Originally, blowback was CIA internal coinage denoting the unintended, harmful consequences-to friendly populations and military forces-when a given weapon is used beyond its purpose as intended by the party supplying it.
In formal print usage, the term blowback first appeared in the Clandestine Service History-Overthrow of Premier Mossadeq of Iran-November 1952-August 1953, the CIA's internal history of the 1953 Iranian coup d'état, sponsored by the US and UK, which was published in March 1954 [REF].