For US boats, Mark 14's will begin to 'work' in mid/late 43.
The magnetic exploder for beneath the keel detonation never worked right in WWII but some mods try to correct it.... mid/late43 again.
Happy Hunting!
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" Bless those who serve beneath the deep,
Through lonely hours their vigil keep.
May peace their mission ever be,
Protect each one we ask of thee.
Bless those at home who wait and pray,
For their return by night and day."
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