"Mustafa Kemal Atatürk (pronounced [mustäˈfä ceˈmäl äˈtäˌtyɾc]; 19 May 1881 (conventional) – 10 November 1938) was a Turkish army officer, revolutionary, and the first President of Turkey. He is credited with being the founder of the Republic of Turkey. His surname, Atatürk (meaning "Father of the Turks"), was granted to him in 1934 and forbidden to any other person by the Turkish parliament.[1]

Atatürk was a military officer during World War I.[2] Following the defeat of the Ottoman Empire in World War I, he led the Turkish National Movement in the Turkish War of Independence. Having established a provisional government in Ankara, he defeated the forces sent by the Allies, eventually leading to victory in the Turkish War of Independence. Atatürk then embarked upon a program of political, economic, and cultural reforms, seeking to transform the former Ottoman Empire into a modern and secular nation-state. Under his leadership, thousands of new schools were built, primary education was made free and compulsory, and women were given equal civil and political rights, while the burden of taxation on peasants was reduced.[3] His government also carried out an extensive policy of Turkification.[4][5][6][7] The principles of Atatürk's reforms, upon which modern Turkey was established, are referred to as Kemalism."

As a result of the foregoing, the army has always been highly respected in Turkey.   Erdogan  allowed himself to encroach the army, in  addition to much crap that created. Senior officers who did not share the views for Islamisation of Turkey, were jailed. I guess that were involved external factors too, but underlying everything is the anarchy that Turkish politicians manage to organize in the country during certain periods of time.

And something else. In accordance with the Constitution of Turkey, the army had the right to interfere in political life when things obviously are not going well. A few years ago through parliamentary tricks this right was withdrawn from Erdogan.