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materials critical to national security

Defined in 3 places across 2 titles of the United States Code.

The term "materials critical to national security" means materials—

(A) upon which the production or sustainment of military equipment is dependent; and

(B) the supply of which could be restricted by actions or events outside the control of the Government of the United States.

Same definition in 2 sections

In this section, the term “materials critical to national security” has the meaning given that term in section 187(e)(1) of this title.

Source

Materials Critical to National Security Defined.—In this section, the term “materials critical to national security” has the meaning given that term in section 187(e)(1) of this title.

Source