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  1. 8.8 cm Flak 18/36/37/41 - Wikipedia

  2. What happened to all the flak fired at aircraft during World War II

  3. Flak Definition & Meaning - Merriam-Webster

  4. Anti-aircraft warfare - Wikipedia

  5. Flak division - Wikipedia

  6. Flak 36 88mm Multipurpose Gun - National Museum of the USAF

  7. How Nazi Germany Introduced the FLAK Into the Military Lexicon

  8. Flak Was Our Worst Enemy”: Wilbur Bowers' Air War Over Europe

  9. ‘The flak can’t always miss. Somebody’s gotta’ die’

  10. For Allied Planes and Tanks, Germany's 88mm Flak Gun