The U.S. Navy began installing combustion trim loop systems this month on amphibious ships to improve fuel efficiency and save up to 2,400 barrels of fuel per ship annually. The Naval Sea Systems Command (NAVSEA) tested system, coupled with a new stack gas analyzer, automatically optimizes the fuel-air mixture for the ships' two boilers, making them more efficient. The trim loop system also protects the environment and increases crew safety by automatically preventing black or white smoke conditions. This initiative, part of NAVSEA's Fleet Readiness Research & Development Program (FRR&DP), supports the secretary of the Navy's efforts to reduce total energy consumption on naval ships.