The former Air Force base is now operated by a private aviation firm.
The company is called Pegasus Technologies Inc.
From their web-site.:
"Operating out of Reynolds Airpark in Green Cove Springs, Florida, FAA airport identifier FL60, our staff is comprised of highly motivated, subject
matter professionals in a number of aviation disciplines, to include flight, maintenance, avionics, and a range of enabling technologies. Because of
this, Pegasus and its business partners and affiliates can provide creative, one-of-a-kind solutions to one-of-a-kind customer needs—whenever and
wherever the customer requirement may exists.
Pegasus is a Part 91 operator with extensive fixed- and rotor-wing experience, Part 23, 25, 27, and 29 aircraft. The combination of our flight
department, maintenance, avionics, and technology departments provide your team with:
Aerial photography and remote sensing services and products
Highly qualified personnel in the form of aircrews and subject matter experts in a number of aviation disciplines
Aircraft and services to support RDT&E of specialized aircraft equipment and systems
FAA Part 145 Certified Repair Station (CRS), license QGOR102Y
FAA charts and publication sales
Long-term business relationships with industry suppliers and manufacturers
Over a million hours of flight experience, to include thousands of hours in experimental aircraft
Pegasus’ goal is to provide responsive, substantive, and safe aerial support for your mission on a world-wide basis. Our team brings to your
business needs first hand knowledge and experience in any field environment and in a range of aircraft; everything from a single-engine reciprocating
aircraft, to single and twin-turboprop platforms, to single and twin turbine helicopters."
Ok, if anyone wants to do some real digging than there is your start..
Play around with the "street view" feature on Google Maps. You can manage to get a view of Pegasus' entrance including a side shot of a white
vehicle. Note: there is no UN on the side..
Also, United Nations always includes many very visible instances of the "UN" on their vehicles for ID purposes. Notice there are none here.