Military-grade flashlights with water-proof housing, diverse lights modes, and long battery existence

https://www.scribd.com/document/992501605/Adapting-to-Darkness-How-Flashlights-Have-Evolved-to-Meet-the-Needs-of-Modern-Military-Operations-143111

Military-grade flashlights with water resistant housing, more than one lights modes, and long battery lifestyles, engineered for serious missions and area toughness.