This paper presents an analytical mapping of the US Department of Defence (DoD) Command, Control, Communications, Computers, Intelligence, Surveillance and Reconnaissance (C4ISR) AF onto the Generalised Enterprise Reference Architecture and Methodology (GERAM) framework. The analysis aims to find artefacts within C4ISR that match the scope of the GERAM components. The scope of the study covers reference architectures (including life cycle / life history concepts and modelling framework) and associated modelling methodologies, languages and reference models, modelling tools and generic modelling concepts. The analysis identifies areas of concern within C4ISR and proposes some solutions as necessary, thus demonstrating the use of GERAM in evaluating AFs and potentially assisting in their future development.