What is the lightest weight operational jet/turboprop fighter ever deployed in combat? Since the beginning of WWII there was been a trend towards larger fighter aircraft. In about 1960 the United States continued with larger fighters (F4, F100, F111, F15) but also started a branch of very small light weight fighters (F105, F16, Tucano, etc).

What is the lightest weight jet/turboprop fighter any nation has ever deployed in actual combat?

Epilogue: I learned more from this discussion than I expected. As I recall, at least one South American country used the BD5J but it never saw combat. That's why I included the combat stipulation. - Thanks for the answers...
The A-37 Dragonfly is the smallest production combat aircraft I'm aware of.

Empty weight of  6,211 lb (2,817 kg). Max takeoff weight of 14,000 lb (6,350 kg).