 Complete the following phrase:  The ribbon is 32 millimetres wide, with a 4 millimetres wide green band, a 2 millimetres wide white band and a 7 millimetres wide dark blue band, repeated in reverse order and separated by a 6 millimetres wide yellow band in the centre. The green and yellow colours have their origin in the ribbon colours of the three awards which were belatedly instituted in 1920, as retrospective awards for Boer veteran officers and men of the 