The missing link between the General Dynamics/Grumman F-111B and Grumman F-14 Tomcat.
As previously discussed, the F-14 Tomcat was developed in the wake of the F-111B 'Sea-Vark' failure using largely the same concepts but packaged better.
In between, there were other contenders from the US Navy's VFX programme. One of those was the Ling-Temco-Vought (LTV) V-507 Vagabond. This was in effect an Americanized Dassault Mirage G, which was France's swing-wing fighter prototype.
The aircraft was designed to French specifications and needed major modifications to meet US Navy standards and requirements. By far, the biggest hurdle was perhaps the need to shoehorn the F-111B's Hughes AWG-9 radar and AIM-54 Phoenix BVRAAM combination into an airframe originally designed for smaller Cyrano series radars from what was then Thomson-CSF.