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yeah my father in law worked at Lockheed before retiring and before that in the Air force. all his projects were classified and he spent allot of time at the pentagon or over at Langley. The internal systems at Lockheed were not connected to the internet. they had separate "public" systems that were. but people would stick their usb drive into the public system and then into the internal system- bingo a virus would jump to the internal system. the sd cards would come with the same risk potential as usb connectivity.
your buddy is better off with a paperback.
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