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Reading 'OP 1664 US Explosive ordnance' from 1947.
Pages 42-45 are about 'window' projectiles. 5 inches diameter, with three possible 'Window Load' Mk1, Mk2, Mk4.
Could someone explain what is the purpose of this kind of projectiles ?
Windows, Chaff a form of Radar countermeasures. The shells eject a large quantity of aluminium tinsel (very Radar reflective) that obscures the vessel's own radar reflection.
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