FedEx Ground, a subsidiary of the FedEx Corporation, is an American ground package delivery company headquartered in Moon Township, Pennsylvania, a suburb of Pittsburgh. The company began as Roadway Package System (RPS), founded in 1985 by transportation company Roadway Services Inc., later renamed Caliber System. FedEx bought Caliber in 1998 to complement its existing FedEx Express business and rebranded Caliber's RPS package delivery service FedEx Ground in 2000.