зона, вільна від перешкод
accident-free flying / mishap-free flying
mishap-free flying / accident-free flying
free fire zone
nuclear-free zone
weapons free zone (WFZ)
grid zone / grid-zone
no-fly zone; air exclusion zone
zone standard time (zone time) (ZST)
killing zone / kill zone
grid zone designation / Grid Zone Designator
grey-zone / grey zone (international relations)
hundred-per-cent zone (one-hundred-per-cent zone)
no-fire zone / no fire zone
antiboat obstacle
antipersonnel obstacle
antipersonnel obstacle breaching system (APOBS)
antitank obstacle
antivehicular obstacle
artificial obstacle
barbed wire obstacle
beach obstacle
composite obstacle
concrete obstacle
demolish an obstacle
incendiary obstacle
log obstacle
man-made obstacle
mine obstacle
natural obstacle
obstacle belt/ course
obstacle development
obstacle race