United States Marine Corps created a full-scale replica (FSR) of a Chengdu J-20 on December 2018. The replica was spotted parked outside the Air Dominance Center at Savannah Hilton Head Airport in Georgia. The United States Marine Corps later confirmed that the aircraft was built for training. In April 2009, a "Wall Street Journal" report indicated that, according to the Pentagon, information from the Lockheed Martin F-35 Lightning II had been compromised by unknown attackers that appeared to originate from China. There is some speculation that the compromise of the F-35 program may have helped in the development of the J-20. See also here-below under Targeting and communication.