This paper presents the automatic transformation of a Field Artillery Conceptual Data Model (FADM) into a High Level Architecture (HLA) Object Model Template (OMT) Model (HOM). It is part of a series of transformations from field artillery mission space to federation architecture to executable distributed simulation code. The approach followed in the course of this work adheres to the Model-Driven Engineering (MDE) philosophy. The model transformation is carried out with the Graph Rewriting and Transformation (GReAT) tool and partly hand-coded in C++. Given a conceptual data model, a simulation object model is produced, tailored according to one of the three object class generation schemes, expounded in the paper. © 2010 IEEE.