Although collective defense is NATO's defining mission, its famous Article 5 has been invoked only once, and Historical Dictionary of NATO and Other International Security Organizations explores this and other key aspects of the Alliance's history and operations.

The volume includes a chronology, an introduction, and a comprehensive bibliography. Its cross-referenced dictionary entries its Secretaries-Generals, its Supreme Allied Commanders-Europe, plus all affiliated organizations created to enhance NATO's reach in a broader Euro-Atlantic security architecture (e.g. North Atlantic Consultative Council, Euro-Atlantic Partnership Council, NATO-Russia Charter; NATO-Ukraine Charter, and NATO-Mediterranean Dialogue Partners).

Notable updates include:
2008 - Russia-Georgia War: The conflict increased tensions between NATO and Russia and influenced future NATO policy toward Eastern Europe.
2009 - Albania and Croatia joined NATO, expanding the Alliance to 28 members.
2011 - NATO conducted Operation Unified Protector in Libya, enforcing a UN-authorized no-fly zone during the Libyan Civil War.
2014 - Russia annexed Crimea, prompting NATO's largest reassessment of European security since the Cold War.
2017 - Montenegro joined NATO as the Alliance's 29th member.
2019 - NATO celebrated its 70th Anniversary and expanded efforts to address cyber and hybrid threats.
2020 - North Macedonia joined NATO as the Alliance's 30th member.
2021 - NATO completed its withdrawal from Afghanistan, ending the Alliance's longest military operation.
2022 - Russia's full-scale invasion of Ukraine transformed NATO's strategic environment.
2023 - Finland joined NATO, becoming the Alliance's 31st member.
2024 - Sweden joined NATO, becoming the Alliance's 32nd member.