This C-9B was known as RY-529 with VR-59 and the name City of Fort Worth from March 1987 up to March 2000. It was moved to VR-46 in April 2000, then to VR-61 in February 2013 and eventually transferred to the US Marine Corps in February 2014. In April 2017, the Nightingale was transferred to the USAF as a testbed, still as 161529. It was last reported in mid-2021. Status since unknown. Together with sistership 161530, 529 brought a visit to the Netherlands in support of the US Marine Corps music band.

Former USN C-9B that went to the USMC's VMR-1 and, as such, visited Rotterdam together with its sister Skytrain 161530 in 2015. In 2020, the aircraft was transferred to the USAF, retaining its BuNo as serial, to be used as a testbed.