List of Chiefs of the General Directorate of Security
Table:
#	Chief	Begin	End

1	İsmail Hamit Oktay	24 October 1923	6 February 1924

2	Muhittin Üstündağ	23 February 1924	29 June 1925

3	Rıfat Danışman	21 September 1925	5 August 1930

4	Tevfik Hadi Baysal	5 August 1930	17 July 1934

5	Şükrü Sökmen Süer	20 September 1934	17 July 1939

6	Ali Rıza Çevik	17 July 1939	11 July 1941

7	Osman Nüri Adal	11 July 1941	3 August 1946

8	Haluk Nihat Pepeyi	13 November 1946	7 July 1947

9	Ahmet Demir	22 August 1947	15 November 1947

10	Gafur Soylu	15 November 1947	16 June 1950

11	Ferruh Şahinbaş	20 June 1950	21 September 1950

12	Servet Sürenkök	21 September 1950	25 January 1952

13	Kemal Aygün	31 January 1952	1 June 1954

14	Ethem Yetkiner	5 June 1954	12 September 1955

15	Kemal Aygün	12 September 1955	9 October 1957

16	Cemal Göktan	9 October 1957	17 May 1960

17	Necip San	2 June 1960	5 January 1961

18	İhsan Aras	17 April 1961	16 July 1963

19	Ahmet Demir	16 July 1963	3 December 1965

20	Hayrettin Nakipoğlu	3 December 1965	15 October 1969

21	Ömer Naci Bozkurt	20 May 1970	28 April 1971

22	E.Sedat Kirtetepe	28 April 1971	18 Jan 1972

23	Orhan Alaeddin Erbuğ	18 January 1972	22 June 1974

24	Celalettin Tüfekçi	13 August 1974	25 February 1976

25	Metin Dirimtekin	9 April 1976	3 October 1977

26	Vecdi Gönül	22 October 1977	22 February 1978

27	Gürbüz Atabek	22 February 1978	6 June 1978

28	Ali Haydar Özkın	19 July 1978	3 December 1979

29	Refet Küçüktiryaki	3 December 1979	11 April 1980

30	İsmail Dokuzoğlu	11 April 1980	12 September 1980

31	Hayrettin Tolunay	12 September 1980	2 January 1981

32	Fahri Görgülü	2 January 1981	19 April 1984

33	Saffet Arıkan Bedük	19 April 1984	14 January 1988

34	Sabahattin Çakmakoğlu	14 January 1988	11 April 1990

35	Necati Bilican	16 April 1990	9 July 1991

36	Ünal Erkan	9 July 1991	18 February 1992

37	Yılmaz Ergün	18 February 1992	10 July 1993

38	Mehmet Ağar	10 July 1993	31 October 1995

39	Alaaddin Yüksel	12 April 1996	26 May 1997

40	Kemal Çelik	26 May 1997	1 August 1997

41	Necati Bilican	1 August 1997	11 June 1998

42	Necati Bilican	18 July 1998	9 June 1999

43	Turan Genç	12 June 1999	13 June 2001

44	İbrahim Kemal Önal	21 June 2001	31 January 2003

45	Gökhan Aydıner	1 February 2003	5 December 2006

46	Oğuz Kağan Köksal	12 March 2007	10 March 2011

47	Mehmet Kılıçlar	11 March 2011

Reviewing the tabular data covering 'List of Chiefs of the General Directorate of Security' in the '' section, formulate a single-sentence overview of the highlighted cells and format it within the following JSON object {"answer": "YOUR ANSWER"}.