[kach22i]

Northrop X-4 Bantam
Northrop X-4 Bantam

The X-4 was developed for the study of flight characteristics of swept wing semi-tailless aircraft at transonic speeds (about Mach .85). Northrop built two X-4s. The No. 1 aircraft was first flown by Northrop on Dec. 16, 1948, and the second X-4 made its initial flight on June 7, 1949.

http://www.whiteeagleaerospace.com/x-1a-max-altitude-mission/

The USAF/Northrop X-4 was an early X-plane designed to explore the flight characteristics of a swept-wing, tailless aircraft in transonic flight. It came into being as a result of recent Air Force studies which indicated that a tailless configuration might alleviate or eliminate instability issues associated with supersonic flight. The X-4’s external configuration was similar to that of the German Me163 Komet and the British De Havilland DH.108 Swallow.

Video in link below, check out the chase plane.
https://airwingmedia.com/hangar/2014/northrop-x-4-bantam/