Before you is a new military variant of the Boeing 707: the E-6B Mercury, used by the US Navy.
It retains the general shape of the 707, but has different wingtips and some specific changes to the fuselage. It also has a more modern cockpit than other 707 modifications. It was one of the last 707s produced.
This mod features an E-6B with one livery (theoretically others could be added), a detailed cockpit and all the GTA performance elements including landing gear, flaps, doors, etc..