area
army
arrest
background
barb
barbed
barbwire
barrier
border
boundary
cage
camp
captivity
closeup
confidential
country
crime
danger
defense
fence
freedom
guard
high
hopeless
imprisoned
iron
jail
law
link
metallic
military
obstacle
perimeter
prison
private
property
protect
protection
refugee
rights
safety
security
sharp
sky
steel
wall
war
white
wire
zone