Nguyễn Nhật Chiêu

Nguyễn Nhật Chiêu was a Mikoyan-Gurevich MiG-21 pilot of the Vietnamese People's Air Force ; he flew with the 921st Fighter Regiment first with the MiG-17 before transitioning into the MiG-21, and is tied for fourth place amongst Vietnam War fighter aces with six kills.
Contrary to popular accounts in U.S. text, Nguyễn Nhật Chiêu preferred flying the MiG-21 into combat over the MiG-17, stating that: "for me personally, I preferred the MiG-21 because it was superior in all aspects of climb, speed and armament. The Atoll missile was very accurate and I scored four kills with the Atoll... in general combat conditions I was always confident of a kill over an F-4 Phantom when flying a MiG-21."
The following kills are officially acknowledged and credited to him by the VPAF:

20 September 1965, an American F-4 Phantom II ;
7 July 1966, a USAF F-105D Thunderchief ;
17 July 1967, a USN F-8 Crusader;
23 August 1967, a USAF F-4D ;
7 October 1967, a USAF F-105F Wild Weasel ;
29 October 1967, an F-4 Phantom.