|Pos.|Name|Place of Birth|Date of Birth|Previous Club|Date Joined|Fee|
|---|---|---|---|---|---|---|
|GK|Alan Buck|Colchester|25 August 1946|Youth Team|1 August 1964|Free|
|GK|Sandy Kennon|Johannesburg|28 November 1933|Norwich City|6 March 1965|Free|
|DF|Duncan Forbes|Edinburgh|19 June 1941|Musselburgh Athletic|14 April 1962|Free|
|DF|John Fowler|Leith|17 October 1933|Bonnyrigg Rose Athletic|20 August 1955|Free|
|DF|Brian Hall|Burbage|9 March 1939|Mansfield Town|6 March 1965|Free|
|DF|Mick Loughton|Colchester|8 December 1942|Youth Team|1 August 1964|Free|
|DF|Ray Price|Hetton-le-Hole|18 May 1944|Norwich City|6 February 1965|Free|
|DF|David Raine|Darlington|28 March 1937|Doncaster Rovers|24 September 1965|Free|
|MF|Barrie Aitchison|Colchester|15 November 1937|Tottenham Hotspur|22 August 1964|£750|
|MF|Bobby Blackwood|Edinburgh|20 August 1934|Ipswich Town|1 September 1965|Free|
|MF|Arthur Kaye|Higham|9 May 1933|Middlesbrough|21 August 1965|Free|
|MF|John Mansfield|Colchester|13 September 1946|Youth Team|1 August 1964|Free|
|MF|Derek Trevis|Birmingham|9 September 1942|Aston Villa|7 March 1964|Free|
|FW|Peter Bullock|Stoke-on-Trent|17 November 1941|Southend United|30 October 1965|Free|
|FW|Reg Stratton|Kingsley|10 July 1939|Fulham|21 August 1965|Free|

Question: how many players are listed as df?
Answer: 6