3d illustration
agency
agent
army
authority
base
box
classified
close
combination
communication
confidential
danger
data
data center
database
defense
document
energy
event
facility
government
guard
information
lock
military
monitoring
national
patrol
people
personal data
police
protect
protection
safety
secrecy
secret
secrets
security
service
services
spying
strength
surveillance
threats
watching