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«The US government can directly combine GPL and proprietary/classified software into a single program arbitrarily, as long as the result is never conveyed outside the U.S. government, but this approach should not be taken lightly» - http://www.theregister.co.uk/2012/06/08/us_navy_linux_drones/
If you're hit by a rocket controlled by GPLed software, it does not obviously count as 'distribution'. ‎- 9000