Security can mean security against hackers, but it can also mean security against revealing classified information. Classified information about weapons systems (e.g. performance characteristics) is inherently embedded into the code running on those systems, and therefore shouldn't be open sourced.
Security can mean security against hackers, but it can also mean security against revealing classified information. Classified information about weapons systems (e.g. performance characteristics) is inherently embedded into the code running on those systems, and therefore shouldn't be open sourced.
Source: used to write classified code