He briefly served as the deputy prime minister in the cabinet led by Nihat Erim immediately after another military coup in 1971.

[3] He was first involved in the secret activities in November 1954 to carry out a military coup against the government led by Prime Minister Adnan Menderes.

[5] In February 1959 he managed to get support from Cemal Gürsel, commander of land forces, to implement the planned coup.

[3] Cemal Gürsel, leader of the 1960 military coup and President of Turkey, appointed Koçaş as a senator in 1962.

[10] In these books Koçaş reports the existence of an extremely secret service within the state apparatus which was allegedly led by Fuat Doğu, the undersecretary of Turkish National Intelligence Agency.

[10] This claim was also shared by Prime Minister Nihat Erim, and they managed to remove Fuat Doğu from office.