Navies around the world are beginning to prioritize alternative fuels for their gensets to navigate the changing landscape of decarbonization and fuel supply dynamics influenced by commercial shipping. Logistics concerns, including fuel availability and change flexibility, are driving the consideration of biofuels as a preferred alternative over ammonia and methanol. Efforts like the University of South Carolina's non-carbon fuel supply chain project, collaborations between ORNL, FMD, and OEMs, and the approval of the MAN 175D engine for biofuels exemplify the industry's shift towards sustainability. Companies like ABC are introducing multi-fuel engines, such as the Evolve platform, tailored for naval applications, while navies explore options like methanol, ammonia, and hydrogen for their vessels. Despite the potential of alternative fuels, challenges like limited supplies and bunkering locations for hydrogen, ammonia, and green methanol are noted. Naval engineers are also focusing on noise, vibration, and shock characteristics in gensets, with advancements in technology to meet stringent requirements. Overall, the article highlights a positive sentiment towards the adoption of alternative fuels in naval operations for a more sustainable and efficient fleet.