That was exactly the sign (among some more barrels, barber wire obstacles and a Scorpion tank) in front of the main gate of the British camp in VITEZ B&H back in 1996. So I guess its a UK sign....
AAA there was also a pit in the middle of the camp for those not complying with the camp commandant orders.
For the record it was home of the EW squadron, a Light infantry battalion and the GURKA battalion and Yes me the Intel chap..........no commends please.