18 U.S.C. § 2151 (Title 18—Chapter 105: Sabotage)
As used in this chapter [18 U.S.C. §§ 2151 et seq.]:
The words "national-defense material" include arms, armament, ammunition, livestock, forage, forest products and standing timber, stores of clothing, air, water, food, foodstuff, fuel, supplies, munitions, and all other articles of whatever description and any part or ingredient thereof, intended for, adapted to, or suitable for the use of the United States in connection with the national defense or for use in or in connection with the producing, manufacturing, repairing, storing, mining, extracting, distributing, loading, unloading, or transporting of any of the materials or other articles hereinbefore mentioned or any part or ingredient thereof.