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This is an image of the fall of the Berlin Wall which signified the eventual downfall of the Soviet Union. This led to a series of questions for NATO, most prominently, was NATO still needed if its adversary was no more? NATO answered this by shifting its focus to world peacekeeping.
(Photo credit- Gerard Malie) http://america.aljazeera.com/articles/2014/11/9/berlin-wall-25-years4.html

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This is a picture of Soviet tanks in Afghanistan in the 1980s. These tanks were part of the Soviet Afghan war. This war led to increased tensions between the Soviet Union and NATO as the Soviet Union was invading a foreign country to install a communist leader.
(Photo credit Georgi Nadezhdin) https://www.theatlantic.com/photo/2014/08/the-soviet-war-in-afghanistan-1979-1989/100786/

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This is an image of the Berlin Wall that separated the communist east and the democratic west. This is important to NATO as it literally cemented the divide between it and the Soviet Union for the next thirty years.
https://www.nato.int/cps/en/natohq/declassified_139339.htm

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This photo shows the mushroom cloud of the Soviet Union’s first nuclear test in August of 1949. This is significant as before the test NATO relied solely on America’s nuclear arsenal for defense, but now NATO would need to establish a command structure which they ultimately did with the outbreak of the Korean war.
https://en.m.wikipedia.org/wiki/RDS-1

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This is a picture of the World Trade Center after the terrorist attacks. The attacks are important as they are the only time in NATO’s history that it invoked Article 5, which says that an attack against one country is like on them all. These attacks also showed the importance of peacekeeping abroad as violence abroad could lead to violence domestically.
https://en.m.wikipedia.org/wiki/September_11_attacks

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This is a picture of a tank that was part of a NATO peacekeeping force in Yugoslavia. The ethnic cleansing in Yugoslavia was a major event in NATO’s shift from defense to peacekeeping. Once it became known to NATO that ethnic cleansing was occuring, NATO responded with airstrikes and later ground troops to stop the war crimes.
https://www.nato.int/cps/en/natohq/declassified_139339.htm

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This is an image of military vehicles crossing between North and South Korea taken during the Korean War in 1950. The Korean War was important to NATO as it caused NATO to establish a consolidated military structure to defend itself.
https://www.nato.int/cps/en/natohq/declassified_139339.htm

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This is a photo of United States Secretary of State, Dean Acheson, signing the North Atlantic Treaty on April 4, 1949. Standing beside him are President Truman and Vice President Barkley. The North Atlantic Treaty was the treaty that established NATO.
https://www.nato.int/cps/en/natohq/declassified_139339.htm

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The picture above shows America President Ronald Reagan, on the right, and Soviet Premier Mikhail Gorbachev, left, signing the Intermediate-Range Nuclear Forces Treaty, INF for short, in the White House. This treaty was in response to the renewal of tensions between the Soviet Union and the United States that were caused by the Soviets deploying ballistic missiles. The signing of this treaty intimated to the end of the Cold War.
https://www.nato.int/cps/en/natohq/declassified_139339.htm

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This is a poster about the Marshall Plan, also known as the European recovery program. The Marshall Plan, funded by the United States, provided aid to European countries to foster economic stability after the second world war. This economic stability helped fight the spread of communism as communism sprang up in places of unrest. The poster shows America holding up Europe with the caption that translates to ‘We are building a new Europe.’
https://www.nato.int/cps/en/natohq/declassified_139339.htm