:  This response is based on the information provided.  We suggest you discuss with your contracting team, program manager and/or legal department as appropriate. 

Whether you classify it as a product or a service is your decision.  You make your choice by what you are acquiring.  From the background, you describe acquiring platforms and components which indicates a product/supply.  The question is, "How much maintenance is included over the course of the contract?"  If you are purchasing some equipment but maintaining it and possibly more, it could be considered a service.  Are the majority of the dollars going toward equipment or toward maintenance?