U.S. Army Field Manual 30-31B

The US Army Field Manual 30-31B, dubbed the "Westmoreland Field Manual,"  purportedly outlined a strategy called the "strategy of tension," wherein violent attacks are orchestrated and blamed on left-wing groups to justify government action. However, some people believe it to be a Cold War-era hoax conducted by Soviet intelligence services.

The document first surfaced in the 1970s in Turkey and later circulated in various countries. During a 1980 hearing CIA officials denied its authenticity by claiming it as a forgery. Scholars and the US State Department also state that it is a Soviet forgery. Its usage in implicating the CIA in certain events further fueled debate, but its fraudulent nature was solidified by evidence uncovered during Operation Gladio in the 1990s.

History
The first mention of the document was in the Turkish newspaper Barış (sometimes anglicized to Barish), in 1975. It was labelled as supplement B (hence "30-31B"), although the publicly released version of FM30-31 only has one appendix, Supplement A.

A facsimile copy of FM30-31B then appeared a year later in Bangkok, Thailand, and in various capitals of north African states. In 1978, it appeared in various European magazines, including the Spanish Triunfo and El Pais. The Italian press picked up the Triunfo publication, and a copy was published in the October 1978 issue of L'Europeo.

A wide range of field manuals, including 30–31, can be accessed through websites that catalog U.S. field manuals. However, 30-31B is not among the field manuals published by the military.

The "Westmoreland Field Manual" (so named because it bears the alleged signature of General William Westmoreland)  was mentioned in at least two parliamentary commissions reports of European countries, one about the Italian Propaganda Due masonic lodge, and one about the Belgian stay-behind network. The latter says that "the commission has not any certainty about the authenticity of the document".

Authenticity
At a 1980 hearing of the House of Representatives Permanent Select Committee on Intelligence, Subcommittee of Oversight, CIA officials testified that the document was a singularly effective forgery by the KGB and an example of Soviet covert action.

Scholars Peer Henrik Hansen and Thomas Rid, both specializing in Cold War intelligence, and the U.S. State Department claim the document is a forgery by Soviet intelligence services. The document first appeared in Turkey in the 1970s, before being circulated to other countries. It was also used at the end of the 1970s during Operation GLADIO, to implicate the Central Intelligence Agency in the Red Brigades' kidnapping and assassination of former Italian prime minister Aldo Moro.

The discovery in the early-1990s of Operation Gladio (NATO stay-behind networks) in Europe led to renewed debate as to whether or not the manual was fraudulent. In Allan Francovich's three-part BBC documentary on the subject, Licio Gelli, the Italian leader of the anti-Communist P2 freemason lodge, stated "The CIA gave it to me." In the documentary, Ray S. Cline said "I suspect that it is an authentic document", but former CIA head William Colby said "I have never heard of it.".