[citation needed] His mother was the sister of Father John MacMillan of Barra for whom the 2/4 march piping tune was named.
[3] During World War II, Duncan served with the Submarine Surveillance Mine Sweeping Service in the Mediterranean and Aegean Seas.
[2] On his return from the war, he became a joiner for the Clan Line and Stephen shipyards, whilst taking piping lessons in his free time.
[2] He was awarded the Balvenie Medal by Messrs Wm Grant & Son in 1996 for his piping achievements.
[2] After his death the Duncan Johnstone Memorial Competition was set up by the National Piping Centre.