The secret exploits of the men stationed in Berlin to sabotage the Soviet Union from within had the Cold War turned hot have been revealed for the first time.
Incredible images show the men from the clandestine Special Forces Berlin unit, which the USA only revealed existed in 2014, on training exercises and meeting up in casual wear.
Other shots show the graffiti-clad Berlin Wall with Soviet soldiers patrolling along the top, tunnels and sewers the Special forces used and various identity cards the undercover soldiers used.
The US Special Forces Berlin unit, pictured, were trained to sabotage enemy communications and infrastructure in the event the Cold War ever turned hot
The men were trained to operate behind enemy lines - such as these Berlin sewers - and create havoc to stall any Soviet invasion of Western Europe with just two hours' notice
The men all had to learn German and fully immerse themselves in local culture and were very close to being called up on several occasions - such as when the Berlin Wall was created
The never-before published pictures have been included in a new book, Special Forces Berlin, which details the clandestine Cold War operations of the US Army’s Elite between 1956 and 1990.
The book is written by ex-soldier James Stejskal who served with the Berlin unit in the 1970s and 1980s for a total of eleven years. It is published by Casemate.
He said: 'The wartime mission was 1) cause havoc behind the enemy’s lines through the sabotage of critical infrastructure and 2) report enemy movements by HF Radio, so that the US Air Force could hit them as they moved forward and to let the US Commander know what was unfolding at his front.
'The Commander in Chief's order was "Buy Me Time!" In the early 1970s the unit received an additional mission: Counterterrorism, making it the first US military unit to be so designated.'
Some of the times the unit was placed on full alert are still classified and cannot be published