Scenarios play an important role in planning, engineering and executing a distributed simulation environment. During the simulation environment engineering process the operational scenarios provided by the user are refined into one or more conceptual scenarios and finally executable scenarios are derived which are used for initializing and stimulating participating simulation systems and other member applications. Conceptual scenarios provide the linking elements between operational scenarios and executable scenarios. Although complete and precise specification of conceptual scenarios is of crucial importance for the whole simulation environment engineering process, we find very little (if at all) guidance on how to specify and document conceptual scenarios. This paper presents how the Base Object Model (BOM) standard may be utilized for specifying conceptual scenarios. We demonstrate the applicability of the BOM standard for a fictitious air defense scenario. To set the stage, firstly, we give an overview about scenarios in military simulation environments and their place in the simulation environment engineering process. Secondly, the main part of this paper presents the example scenario as a case study for utilizing the BOM standard for specification of conceptual scenarios.