noun
essential elements of information
Technical term used in military, intelligence, or security contexts to denote critical information requirements.
作戦前に、指揮官は情報主要素を特定する。
Before an operation, the commander identifies the essential elements of information.
Compound of 情報 (information) + 主要 (main, essential) + 素 (element). The exact origin as a fixed term is uncertain, but it likely arose as a direct translation of the English military/intelligence phrase 'essential elements of information'.