P-39 wasn't used for ground attack by the Soviets.
They actually liked it because it was the only Lend Lease fighter that had it's armament in the nose (37 or 20mm cannon and 2 .50 machine guns) .30 wing guns were typically removed.
Soviet crews actually loathed the Spitfire, oddly enough because of it's wing mounted guns.
Thanks. I always thought that was one of its main roles but did a little research and you are correct. Thanks again!