It could be a real killer.
For the purposes of Lockheed's marketing campaign, the F-21 is a new fighter, although it shares many of its major features with the F-16V the company has sold to Bahrain, Greece, Slovakia, South Korea and Taiwan. Lockheed can build new F-16Vs or upgrade older F-16s to the V-standard.
Lockheed Martin in mid-February 2019 offered to sell India a new fighter the company calls the "F-21."
(This first appeared several months ago.)
Only it doesn't...
Read this story at The National Interest