The j-7c/d (also known as j-7iii and j-7iiia respectively) fighters are chinese copies of the russian mig-21mf (fishbed-g'), based on examples obtained a third-country (egypt or romania) in the 1980s. The reverse-engineering was not entirely successful and as a result the aircraft was only built in a small number. About 50-70 examples have been deployed by two plaaf night fighter regiments since the early 1990s.