13 Secret Military Operations That Were Only Declassified Years Later
Governments and military forces have carried out clandestine operations out of the public eye throughout history. These clandestine, covert operations frequently go unnoticed for decades until their presence is made public by official declassification.
Our perception of historical events and international relations is often altered by the disclosure of these operations. These are amazing military missions that were kept under wraps for years before being made public.
Operation Acoustic Kitty
In the 1960s, the CIA spent approximately $20 million attempting to turn cats into spy devices. The feline agents were surgically implanted with microphones, transmitters, and batteries with the intention of eavesdropping on Soviet conversations.
After years of development, the project’s first field test reportedly ended when the cat was struck by a taxi almost immediately after being released. The project was abandoned in 1967 but remained classified until 2001 when documents were released through the Freedom of Information Act.
Project Azorian
In 1974, the CIA undertook one of the most ambitious covert operations in history—salvaging a sunken Soviet submarine from the Pacific Ocean floor. Using the specially constructed ship Hughes Glomar Explorer as cover for a mining operation, the CIA attempted to recover the K-129 submarine which had sunk in 1968 with nuclear missiles aboard.
The operation successfully retrieved a portion of the submarine from a depth of 16,500 feet, though exactly what was recovered remains partially classified. The project remained secret until 1975 when investigative journalists exposed it.
Operation Gold
American and British intelligence services worked together to excavate a 1,476-foot tunnel from West Berlin into East Berlin at the height of the Cold War. Reaching Soviet military communication networks beneath the divided city was the goal.
Before being ‘found’ by Soviet forces, the tunnel produced useful intelligence for almost a year starting in 1955. The fact that Soviet intelligence was aware of the tunnel from the beginning thanks to their spy George Blake but permitted it to continue in order to safeguard their source wasn’t made public until decades later.
Operation Ivy Bells
In the 1970s, the U.S. Navy, working with the NSA, placed sophisticated recording devices on underwater Soviet communication cables in the Sea of Okhotsk. American divers from specially modified submarines would periodically retrieve the recordings, which provided valuable intelligence about Soviet naval operations.
The operation remained secret for nearly a decade until 1981 when NSA employee Ronald Pelton betrayed the project to the Soviets. The American public wouldn’t learn about Ivy Bells until 1998.
Project SUNSHINE
In the 1950s, the U.S. Atomic Energy Commission secretly collected human remains, particularly those of infants and young children, to measure the effects of nuclear fallout. Without consent from families, researchers collected over 1,500 samples from deceased individuals across the world to study strontium-90 absorption in human tissue.
The operation remained classified until the 1990s when Energy Secretary Hazel O’Leary ordered the declassification of millions of documents related to human radiation experiments.
Operation Gladio
After World War II, NATO countries established secret armies throughout Western Europe as stay-behind forces in case of Soviet invasion. These paramilitary groups, operating under the codename ‘Gladio’ in Italy, stockpiled weapons and prepared for guerrilla warfare against potential communist occupiers.
The operation remained secret until 1990 when Italian Prime Minister Giulio Andreotti confirmed its existence. Subsequent investigations revealed that these networks had sometimes interfered in domestic politics and may have been connected to terrorist attacks intended to discredit political opponents.
MK-ULTRA
The CIA’s notorious mind control program ran from the early 1950s through the late 1960s, conducting hundreds of experiments—many illegal—on unwitting American and Canadian citizens. The program used various methodologies including psychedelic drugs, hypnosis, sensory deprivation, and various forms of psychological torture to attempt to control human behavior.
Most records were destroyed in 1973, but the program became public knowledge in 1975 through investigations by the Church Committee and Rockefeller Commission.
Operation Earnest Voice
The U.S. military developed sophisticated software for manipulating online conversations and spreading pro-American propaganda. The operation involved creating fake online personas (sockpuppets) controlled by U.S. military personnel who could influence discussions in foreign-language chat rooms and social media.
While partially revealed in 2011, many details about the scope and current operations remain classified, though documents indicate it was primarily targeted at audiences in the Middle East and not domestic American conversations.
The Venona Project
From 1943 to 1980, U.S. counterintelligence agencies worked to decrypt Soviet intelligence communications, ultimately revealing extensive Soviet espionage activities in North America. The operation remained classified for over 50 years, finally being declassified in 1995.
The Venona decryptions identified numerous Soviet agents including atomic spies Julius and Ethel Rosenberg, Klaus Fuchs, and Alger Hiss. The secrecy was maintained partly to prevent the Soviets from learning about American code-breaking capabilities.
Project Greek Island
For over 30 years, the U.S. government maintained a secret nuclear bunker at the exclusive Greenbrier Resort in West Virginia intended to house Congress in the event of nuclear war. The 112,000-square-foot facility included dormitories, a cafeteria, a hospital, and chambers for both the House and Senate.
The bunker was kept operational by government staff posing as hotel employees until 1992 when it was exposed by The Washington Post. Tours of the facility are now available to the public.
Operation Mongoose
The Kennedy administration began a clandestine operation to overthrow Fidel Castro in Cuba following the failed Bay of Pigs invasion. The operation involved psychological manipulation, economic warfare, sabotage, and, most infamously, numerous assassination attempts, some of which used strange techniques like poisoned diving suits and exploding cigars.
The true scope of the operation was not formally recognized until the Church Committee investigations in 1975 exposed the government’s assassination schemes, despite years of rumors.
Project OXCART
Before the famous SR-71 Blackbird, the A-12 was a reconnaissance aircraft developed under this highly classified CIA program that began in 1957. Flying at speeds exceeding Mach 3 at altitudes above 90,000 feet, the aircraft was virtually undetectable and untouchable by contemporary technology.
The program operated from Area 51 in Nevada and conducted missions primarily over North Vietnam and North Korea. The existence of OXCART remained classified until the 1990s, though many details about specific missions remain secret.
Operation Paperclip
Following World War II, the U.S. government secretly recruited more than 1,600 German scientists, engineers, and technicians—including many former Nazi party members and some implicated in war crimes. These German experts were brought to America to help advance American technological development particularly in rocketry, chemical weapons, and medicine.
While the program became partially known in the 1950s, the full scope and details of the operation weren’t declassified until decades later. Wernher von Braun, who became crucial to America’s space program, was among the most famous of these scientists.
Shadows of History
These declassified operations reveal the complex moral landscape of national security and the extraordinary lengths governments will go to protect what they perceive as vital interests. From mind control experiments to underwater espionage, these secret missions shaped world events in ways the public couldn’t comprehend until years later.
As documents continue to be declassified, we gain ever deeper insight into how covert operations have silently influenced the course of modern history.
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