The Regimental Colours are Brown, Red and Green. When it was first formed, the Tank Corps had no distinctive colours. Nothing was done about it until just before the Battle of Cambrai in 1917 when General Elles, wanting some distinguishing mark for his tank, went into a shop to buy material for a flag. Although stocks were small, the General bought some lengths of silk-brown, red and green. The silk was sewn together and was flown from his tank 'Hilda' in which he led the Tank Corps into battle.
The colours typified the struggle of the Corps - 'From mud, through blood to the green fields beyond'. This most apt interpretation of the colours was suggested by Colonel Fuller. The flag is flown with the green uppermost.