After the May 27 coup d’état, almost 5,000 military officers were made to retire including the generals and admirals in the army. These officers set up a non-governmental organization called the “Association of Retired Revolutionary Officers” (Emekli İnkılap Subayları Derneği) to return to the army. EMİNSU is the short name of this association. For this reason, members of the association were called EMİNSU. The association was closed after the September 12, 1980 coup d’état. Therefore, the correct option is C.