Decarbonizing heavy-duty trucks has been a challenge, with slow adoption of battery-electric and hydrogen fuel cell trucks in the US. However, the US Army is exploring hydrogen fuel cell electric vehicles for heavy-duty use, including investing in cryo-compression technology to improve hydrogen energy density. The Army's interest in hydrogen vehicles dates back to 2010, focusing on fuel cells for tanks and testing fuel cell vehicles and mobile electrolysis units for generating hydrogen on-site. Verne, a California-based startup, has emerged as a key player in cryo-compressed hydrogen technology, with support from funders like the US Army, Breakthrough Energy, ARPA-E, and Amazon's Climate Pledge Fund. The improved energy density of CcH2 enables compact systems that can fit into existing vehicle spaces, offering significant energy density improvements over traditional compressed hydrogen. The shift towards green hydrogen production through water electrolysis is gaining momentum, with efforts to reduce storage and distribution costs for a more economical hydrogen infrastructure. Overall, the article highlights positive advancements in hydrogen technology and the growing interest in hydrogen vehicles for heavy-duty applications.