I think it was either 23 or 24, I got it twice, once with Italian 3.7, the other time Britain 3.7 lineup, for air it would be 11 kills with my LA-5FN (okay tbf, one of those was an AI)
Edit: Found proof of my 22 kill game
Edit 2: Found my 11 kill game, was with Russian Spit instead of LA-5FN
Again though, one of those severe damages was an AI
Edit 3: This one was also high-ish, 9 deaths is rough though
