Joseph Patrick McMullen was born in Rasharkin or Dunloy. The family later moved to Kilrea. Private Joseph Patrick McMullen was serving with the 1st Battalion of the Connaught Rangers when he was killed in action in Mesopotamia on 11th July 1917. Private Joseph Patrick McMullen has no known grave and is commemorated on the Basra Memorial in Iraq.
Basra is a town on the west bank of the Shatt-al-Arab, 90 kilometres from its mouth in the Persian Gulf. The cemetery is about 8 kilometres north-west of Basra.