The small box is called Switchbox, Destruction, Radio, BC-765, and it was used to detonate a small charge and destroy the plane's IFF radio transponder. IFF, short for "Identification, friend or foe," was an emergent technology during World War II. When a radar signal hit the plane, the transponder would broadcast a code, identifying the aircraft as a friendly so as to avoid attacks by interceptors or ground-based flak.
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