The Irish Marching Society (IMS) was founded in 1979 by a group of individuals who wanted to come together to celebrate the Irish Heritage in the city of Rockford, Illinois. This organization plan and stage, with the help and support of the city of Rockford, the annual St. Patrick's Day Parade. They also hold an annual St. Patrick's Day Party. The group, known as IMS Unit 1, is located in that city.