AIR SUPERIORITY
AMPHIBIOUS OPS
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 zero.
zone 1 (nuclear)
A circular area determined by using minimum safe distance 1 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.
vital ground
Ground of such importance that it must be retained or controlled for the success of the mission. See also key terrain.