Calspan purchased their first Gulfstream III aircraft (N710CF) in 2011 when customers expressed a need for a systems testbed with Learjet performance in a larger airframe and to support Northrop Grumman's Next-Generation Jammer flight test program. The aircraft was modified into a systems test aircraft with engineer stations in the cabin, a reconfigurable antenna base on the top of the external fuselage, a testbed power distribution system. In 2016, Calspan added a second Gulfstream III (N721CF) to support additional contracts. It's now retired at Niagara Falls Airport without engines.