Definition

Warning Order—a preliminary notice of an upcoming operation allowing subordinate units to begin preparations before receiving the full plan. The military's version of 'heads up, something's about to happen.'

Example Usage

Just got the WARNO—we're probably rolling out tomorrow, so start pre-combat checks now.

Origin

Abbreviated from 'warning order,' formalized in operational planning procedures

Fun Fact

A well-crafted WARNO can give subordinates enough information to start useful preparation; a bad one just creates panic and speculation, often simultaneously.

Source: Military Decision Making Process and operations orders doctrine

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