Sorry i do not find a Rankin. ROCKY SPRING PRESBYTERIAN CHURCH "It can not be disputed that in 1738 there was quite a settlement of people between Rocky Springs and Strasburg and around the present (1894) town of Strosburg and between this point and Chambersburg. Among many others the following can be named, viz: James and Samuel Henry; John Hastin; Francis and Samuel Jones; William Baird; Matthew and Robert Patton and James Culberson." This from the "history of the Rocky Springs Church, etc." This Church is near Chambersburg, west and south of the Letterkenny Army Depot.