I don't think Spetznaz has been established during ww2, rather later.
There were some Polish elite units - actually most of polish units could be called elite comparing with other allies.
303 fighter squad - over 200 Germans planes destroyed during battle of Britain - and more later.
ORP Dzik and ORP Sokół - submarines called "terrible twins", about 40 ships sunk on Mediterran Sea
ORP Garland - destroyer - heroes from north conwoys
Strzelcow Karpackich infantry brigade - defenders of Tobruk
Independent Parachute Brigade - only one unit which helped British Division at Arnhem, without them Brits would loose all unit.
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