zero-length launching — (*) A technique in which the first motion of the missile or
aircraft removes it from the launcher.
zero point — The location of the center of a burst of a nuclear weapon at the instant of
detonation. The zero point may be in the air, or on or beneath the surface of land or
water, depending upon the type of burst, and it is thus to be distinguished from ground
zone I (nuclear) — A circular area determined by using minimum safe distance I as the
radius and the desired ground zero as the center from which all armed forces are
evacuated. If evacuation is not possible or if a commander elects a higher degree of
risk, maximum protective measures will be required.
zone II (nuclear) — A circular area (less zone I) determined by using minimum safe
distance II as the radius and the desired ground zero as the center in which all personnel
require maximum protection. Maximum protection denotes that armed forces
personnel are in “buttoned up” tanks or crouched in foxholes with improvised overhead
zone III (nuclear) — A circular area (less zones I and II) determined by using minimum
safe distance III as the radius and the desired ground zero as the center in which all
personnel require minimum protection. Minimum protection denotes that armed forces
personnel are prone on open ground with all skin areas covered and with an overall
thermal protection at least equal to that provided by a two-layer uniform.
zone of action — (*) A tactical subdivision of a larger area, the responsibility for which is
assigned to a tactical unit; generally applied to offensive action. See also sector.
zone of fire — An area into which a designated ground unit or fire support ship delivers, or
is prepared to deliver, fire support. Fire may or may not be observed. Also called ZF.
ZULU time — See Universal Time.