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The story
The ATA was created on 18 June 1954. Since the end of the Cold War and the dissolution of the Warsaw Pact, the role of the Atlantic Treaty Association has changed considerably. In 1992, the ATA Constitution was amended to accommodate associate members and observers from non-NATO countries. In 1992, the Atlantic Club of Bulgaria joined the ATA as its first associated member from a non-NATO country. Given NATO's shifting nature, the ATA now works beyond the borders of the Euro-Atlantic area, operating in Central and Eastern Europe, the Mediterranean, and the South Caucasus. Following the accession of new NATO countries in 1999 and 2004, ATA membership expanded considerably, and its security focus has shifted south and eastward.
The ATA is active in NATO's Partnership for Peace (PfP) and Mediterranean Dialogue programs and is increasingly engaged with officials and institutions based in members of the Istanbul Cooperation Initiative (ICI) and Partners Across the Globe.
From Wikipedia’s article on Atlantic Treaty Association, shared under CC BY-SA 4.0.4