Warfare is undergoing a fundamental shift where tech with big price tags is being challenged by a more agile, decentralized model, spearheaded by Silicon Valley-backed start-ups, industry watchers told CNBC. The traditional defense model — notorious for development cycles that can span decades — is coming under increasing pressure. Companies are instead betting on a new type of warfare, based on shorter lead times that allow for rapid deployments and more cost-effective solutions . Previously,