Seeing there is so much Luft-waffling here is some good old Mother Russia 37mm loving... (quick and dirty video edit sorry, 3 seperate 'incidents'):
There was some debate in the squad about 37mm vs 20mm, I think this is now resolved.
Before the Luftweenies have a cry the Head On was a valid and glorious tactic used by the superior Soviet Air Force. Especially when you have a BFG in the nose