Braille Letter G Flag - Golf

The Braille Letter Flag for G is mostly violet.  The reason being, violet is the 7th colour of the rainbow and G is the 7th letter of the alphabet.

Braille Letter F Flag - Foxtrot

Since indigo (dark blue) is the 6th colour of the rainbow and F is the 6th letter of the alphabet, the Braille Letter F flag is indigo (dark blue).  The assigned contrast indicator for indigo is white, which is why white is included.

Braille Letter E Flag - Echo

Since E is the 5th letter of the alphabet and blue is the 5th colour of the rainbow, the Braille Letter E Flag is blue.  Red is included since it is the assigned contrast indicator for azure-blue.

Braille Letter D Flag - Delta

Since green is the 4th colour of the rainbow and D is the 4th letter of the alphabet, the Braille Letter D Flag is mostly green.  Yellow is included since it is the assigned contrast indicator for green.

Braille Letter C Flag - Charlie

Since yellow is the third colour of the rainbow and C is the third letter of the alphabet we have letter C Braille Flag.  Blue is included as it is the assigned contrast indicator for Braille.

Braille Letter B Flag - Beta

The Braille Letter B Flag is mostly orange since orange is the second colour of the rainbow.  Black is the assigned contrast indicator. 

Braille Letter A Flag - Alpha

The Braille letter A-Alpha flag uses the first colour of the rainbow, since A is first and red is the first visible colour.  The single dot represents the 1st position of the feels that any Braille:Night Writer-Reader will recognize.