Question: The 337th Flight Test Squadron (337 FLTS) was most recently part of the 46th Test Wing and based at McClellan Air Force Base, a former United States Air Force base located in the North Highlands area of Sacramento County, in which US state?
Context: The 46th Operations Group was a component of the United States Air Force 46th Test Wing assigned to Eglin Air Force Base, Florida.  It was inactivated on 1 October 2012, and its functions consolidated under the 96th Test Wing at Eglin Air Force Base, Florida The 46th Test Wing is an inactive wing of the United States Air Force last based at Eglin Air Force Base, Florida.  The wing's 46th Test Group was a tenant unit at Holloman Air Force Base, New Mexico. The 46th Test Group was a United States Air Force unit active from 1992 to 2012.  It was last active with 46th Test Wing, at Eglin Air Force Base, Florida.  The 46th Test Group was stationed as a tenant unit at Holloman Air Force Base, New Mexico, throughout its existence.  It was inactivated on 18 July 2012, being replaced by the 96th Test Group in an administrative reorganization. The 486th Flight Test Squadron is a secretive unit, with a somewhat misleading designation, assigned to Eglin Air Force Base, Florida, and which is associated with United States Department of State Foreign Emergency Support Team activities.  The squadron motto is ""Non semper ea sunt quae videntur"" which translates as "Not always what they seem".  It was apparently assigned to the 227th Special Operations Flight, later redesignated the 150th Special Operations Squadron, McGuire Air Force Base, New Jersey, but is currently assigned to the 46th Test Wing at Eglin, and operates a pair of Boeing C-32B or Boeing 757-23A aircraft, on stand-by alert for special operations and intelligence missions world-wide.  Official documents make it clear that operations fall under the aegis of Air Force Special Operations Command. The 586th Flight Test Squadron (586 FLTS) is part of the 96th Test Wing based at Holloman Air Force Base, New Mexico. The 337th Flight Test Squadron (337 FLTS) was most recently part of the 46th Test Wing and based at McClellan Air Force Base, California.  It performed depot acceptance testing until being inactivated with the closure of McClellan AFB on 13 July 2001. The Holloman High Speed Test Track (HHSTT) is a United States Department of Defense/Air Force aerospace ground test facility located at Holloman Air Force Base in south-central New Mexico.  It is adjacent to the White Sands Missile Range and is operated by the 846th Test Squadron of the 96th Test Group of the 96th Test Wing at Eglin Air Force Base.  The Test Track provides its services to a wide variety of American defense and governmental agencies such as the Air Force, Army, Navy, and the Missile Defense Agency, as well as America's allies. McClellan Air Force Base (1935–2001) is a former United States Air Force base located in the North Highlands area of Sacramento County, 7 mi northeast of Sacramento, California. The 417th Flight Test Squadron is an inactive United States Air Force squadron.  It was last assigned to the 412th Operations Group at Edwards Air Force Base, California, where it was inactivated on 14 February 2012.  The squadron was first activated in 1989 as the 6517th Test Squadron and conducted flight testing of the McDonnell Douglas C-17 Globemaster III until it was inactivated in 1995 as the 417th Test Squadron.  It was reactivated in 2006 and performed ground and flight testing on the Boeing YAL-1A until 2012. The 96th Test Wing is a United States Air Force unit assigned to the Air Force Test Center of Air Force Materiel Command at Eglin Air Force Base, Florida.  The wing was activated at Eglin in 1994 as the 96th Air Base Wing, the headquarters for all support units on Eglin, the largest installation in the Air Force.  In 2012, it absorbed the mission and resources of the 46th Test Wing and added the mission of testing and evaluating weapons, navigation and guidance systems and command and control systems.
Answer: California