A LOW GREENHOUSE GAS (GHG) ADVANCED SPARK IGNITION (SI) ENGINE THAT CAN OPERATE ON NATURAL GAS (NG) AND NATURAL GAS-HYDROGEN (NG/H2) BLENDS WITH DIESEL-EQUIVALENT PERFORMANCE FOR OFF-ROAD APPLICATIONS. THE OBJECTIVE OF THIS TOPIC AREA IS TO DEVELOP AND DEMONSTRATE A COMMERCIALLY VIABLE NATURAL GAS ENGINE THAT CAN SIGNIFICANTLY REDUCE GHG EMISSIONS IN THE NON-ROAD SECTOR, INCLUDING OFF-ROAD, RAIL, AND/OR MARINE.