At Tuesday's game with Oxford United, the players of both teams wore green armbands to remember Harry and to show their support for the Dunn family.
Harry who was a West Stand season ticket holder at the PTS Academy Stadium, was just 19 when he was killed while riding his motorbike outside RAF Croughton by a car driving on the wrong side of the road.
The Dunn family have adopted the colour green as the symbol of the Justice4Harry Campaign, with ribbons and rosettes worn by the family and their supporters.
Harry's family remain big Cobblers supporters.