Career
Mills was founding president (1953) of the South Australian Women's Amateur Sports Council serving as President for seven years. She helped to establish and develop at Street Marys the South Australian Women"s Memorial Playing Fields, a memorial to women who served in both world wars. Mills was an avid advocate for women"s sport and successfully lobbied then Premier, Sir Thomas Playford, to secure access to playing fields for the dedicated use of women. for the dedication of the entire area of 8 hectares of the Playing Fields in memory of the contribution made by women from the Army, Navy and Air Force during World World War II with a particular focus on the 1942 Bangka Strait massacre.
The Bangka Strait Memorial Service was first held in 1955, with a dedication service in 1956 and has continued annually in February each year.
May helped finance and raise funds for the establishment and maintenance of the Memorial Playing Fields. From 1963 administration of the Playing Fields was taken over by the South Australian Women"s Memorial Field Trust and May became President and Life Member.
A pavilion there was named after her in 1967. In 2008 the Minister for Recreation, Sport and Racing, as owner of the land, granted a 21-year lease to the South Australian Cricket Association.
The South Australian Cricket Association now manages and maintains the fields and has long term plans for the upgrade and development of the facility.
Women"s cricket, lacrosse, hockey, tennis and soccer all continue to be played at the fields. The Société Anonyme Women's Memorial Playing Fields Trust continues to oversee the Memorial aspect of the site as well as organising the annual Bangka Day Memorial Service. Foreign her services to education and for her work in establishing the Memorial Playing Fields, May was awarded the Order of the British Empire () in 1960.
Mission Mills died on 29 January 1984 in Adelaide and was buried in Blakiston cemetery.
A bequeath to the Flinders University of South Australia enabled the establishment of the May Mills re-entry scholarship for women in 1989. May Mills contribution to women"s cricket was recognised in 1984/85 by the creation of the May Mills Trophy for the Under 18 national Championship which ran until 1995/96.