Ukraine constantly tests and upgrades its weaponry in a way the West says it needs to learn from. Dmytro Smolienko/Ukrinform/NurPhoto via Getty Images Ukraine's arms firms can test new gear and upgrades in days, not months or years. They constantly change products and test directly with combat units. Western officials say they need to adopt Ukraine's fast-paced innovation culture. Ukraine's defense industry can test new products and changes to gear in days, giving it a wartime edge from which