Just a query. I have an interest in the USAAF in East Anglia during WW2, and often visit some of the old airfileds. One or two have renovated control towers that have been turned into memorials/musuems to the memory to those USAAF personel who served at them during the last war. One of these Tower Museums has a complete Norden Bomb sight on display. I was curious to read that the USAAF treated their Norden Bomb Sight as 'Top Secret'. After, and before each bombing sortie, the Norden sights were kept in a a secure, guarded building on each base. Has there ever been any statistical research carried out as which of the Allied WW2 Bomb sights was the more accurate. The Norden or the RAF's MKX1V, or the German Luftwaffe Lofte Bombsight?