Why Coastal Command U-boat kill totals need attribution checks

Did Coastal Command produce especially successful U-boat-killing units?

Yes, but some Coastal Command totals also count Fleet Air Arm Swordfish units that operated under its shore-based umbrella.

Coastal Command developed a strong anti-submarine record, although organizational attribution can inflate a service label. Shore-based Fleet Air Arm Swordfish units sometimes operated within Coastal Command's structure, and their successes could be counted in Coastal Command totals. The caveat matters when using kill claims to compare institutions instead of assessing the combined campaign.