nuclear-free zone

accident-free flying / mishap-free flying

mishap-free flying / accident-free flying

free fire zone

weapons free zone (WFZ)

obstacle free zone (OFZ)

grid zone / grid-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

flight restriction zone / flight restricted zone (FRZ)

nuclear suitcase bomb; man-portable nuclear weapon

contact-free war

contamination-free

fallout-free

free fall

free fall air drop

free mine

free naval control of shipping

free net

free neutron

free rocket

free-fall bomb

toxic free area

free-fire area

impact free

mine free

anti-aircraft free-flight rocket

free flight

free flight rocket