Heffernan (11 March 1876 – 1962) was an Irish-American nurse who served during the First World War.
She was born in Dublin and immigrated to the US in 1906, where she joined the United States Army in 1910.
She served as a nurse in California and Mississippi, before being stationed at the American hospital at Rimaucourt, France.
After the war, Heffernan went on to see service in China, the Philippines, and Pearl Harbor.
In 2002 a bracelet belonging to Heffernan was discovered by a schoolboy in Rimaucourt, who enlisted the aid of his teacher to return the piece to Heffernan's family.
This was eventually done in 2017.
The efforts to identify Heffernan and return the bracelet were the subject of a film documentary which first aired in January of 2018.