The access to necessary radio spectrum is a decisive factor for the ability of the Swedish Armed Forces to meet their objectives both nationally and internationally. It is foreseen that within the near future the regulation of radio spectrum will undergo a change from a static and slow process to a more dynamic and faster process know as Dynamic Spectrum Access (DSA). In a DSA environment parts of the available spectrum will be made available for dynamic use of instantaneously unutilized frequencies. It is envisioned that a cognitive radio system, that autonomously senses the electromagnetic signal environment and is aware of the user's needs, can perform a negotiation with the spectrum owner regarding access to and use of spectrum and thereby provide a more efficient utilization of the radio spectrum. As a part of the research project Dynamical Telecommunications we investigate how this development in spectrum regulation affects the Swedish Armed Forces access to necessary spectrum for different sensing and communication applications. The present report describes the state-of-the-art regarding DSA in the civilian and military domains. Further we describe issues that must be considered in the development towards DSA and the technical challenges that require further research and development in order to support the needs of the Swedish Armed Forces. The Swedish Armed Forces are in general positive to DSA and recommend DSA for as large fraction of the spectrum as possible, as long as the condition of Non-Interference Basis (NIB) is met. Large commercial actors recommend DSA on a limited set of frequency bands. DSA on a large fraction of the spectrum should increase the possibility for more companies to reach the market place, in particular Small and Medium-sized Enterprises (SMEs). This should promote competition and increase the number of possible vendors to choose from in a communications equipment procurement process. The key issue regarding DSA for the needs of the Swedish Armed Forces is the issue of NIB since reliable communications (high degree of availability and resilience to jamming and interference) is a fundamental requirement for military communications systems. Therefore, the top priority for any DSA concept that involves military users and communications systems must be to address the interference issue.