Indian Air Force will retire one of its four remaining squadrons of the ageing MiG-21 fighters on September 30, the Srinagar-based No. 51 squadron, which is also known as “Sword Arms,” an official familiar with the matter said on Monday told Hindustan Times. Wing Commander (now Group Captain) Abhinandan Varthaman, who was awarded Vir Chakra for shooting down a Pakistani F-16 during a dogfight over the Line of Control on February 27, 2019, was with the No. 51 squadron then. Watch the video for more.