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Fire regimes can be over a wide range of temporal and spatial scales, ranging from viewedseveral years to thousands of years and local to broadly regional. Knowledge of historical temporal and spatial patterns of fire is a key to characterizing and understanding fire regimes.
Free-fire zone. A free-fire zone in U.S. military parlance is a fire control measure, used for coordination between adjacent combat units. The definition used in the Vietnam War by U.S. troops may be found in field manual FM 6-20: