The 1997 military memorandum (Turkish: 28 Şubat, "28 February"; also called Post-modern darbe, "Post-modern coup") in Turkey refers to the decisions issued by the Turkish military leadership on a National Security Council meeting on 28 February 1997. This memorandum initiated the process that precipitated the resignation of Islamist prime minister Necmettin Erbakan of the Welfare Party, and the end of his coalition government.
As the government was forced out without dissolving the parliament or suspending the constitution, the event has been famously labelled a "postmodern coup" by the Turkish admiral Salim Dervişoğlu. The process after the coup is alleged to have been organised by the Batı Çalışma Grubu (Western Working Group), a purported clandestine group within the military.
The operation was planned by generals İsmail Hakkı Karadayı, Çevik Bir, Teoman Koman, Çetin Doğan, Necdet Timur, and Erol Özkasnak.
In 2012, Hasan Celal Güzel said that General Teoman Koman had approached him in September 1996 with a plan to install him or Mesut Yılmaz as Prime Minister after a planned coup. Güzel declined to get involved, and Yılmaz was appointed Prime Minister after the coup.
On 17 January 1997, during a visit to the Turkish General Staff, President Süleyman Demirel requested a briefing on common military problems. İsmail Hakkı Karadayı, Chief of the General Staff, enumerated 55 items. Demirel said half of them were based on hearsay and encouraged Karadayı to communicate with the government and to soften the memorandum's wording.