army
background
banned
barb
barbed
barbwire
barrier
black
border
camp
close up
cloud
concentration
danger
depth
detention
fence
field
forbidden
freedom
graphic
guard
illustration
iron
isolated
jail
metal
military
of
old
pattern
prison
prohibited
protect
protection
razor
rust
safety
secure
security
sharp
silhouette
sky
steel
strung
war
white
wire