The US Department of Defense has been slowly progressing towards integrating electric vehicles into its massive fleet, showing signs of interest in defense contracts related to automotive and battery technologies. Amprius Technologies, a US silicon battery firm, recently secured a spot in the xTechPrime Competition hosted by the US Army. While Amprius currently produces high-performance lithium-ion batteries for premium applications, the company aims to expand its products to electric vehicles as manufacturing capacity grows. The xTechPrime award has led to a $1.9 million contract for Amprius to develop a 500 Wh/kg SiMaxx™ cell for electric mobility applications in the defense sector, with initial focus on aircraft integration. This development aligns with the US Army's modernization goals, particularly in vehicle electrification. Additionally, partnerships with companies like AeroVironment and GDI highlight the Defense Department's interest in silicon-based batteries to enhance energy density and charging speed in lithium-ion batteries. GDI, headquartered in New York, is gearing up for commercial-scale production of silicon anodes to increase battery efficiency in various applications, including electric vehicles. While the article focuses on advancements in silicon battery technology for electric vehicles, it briefly mentions the Defense Department's sporadic interest in fuel cell electric vehicles, with limited progress reported in this area to date.