This is former Gates test registration N400FK. The aircraft was delivered to the USAF on 1 September 1985, and assigned to the 1400th Military Airlift Squadron / Detachment 2 at Randolph (as pictured). The Learjet was transferred to the 332nd AF of the 12th FTW in 1996 and received tailcode RA. The was moved to the 358th AS as part of the 375th AW in 2013. In February 2014, the USAF sold it as N72GH in Pittsburgh.