Strategic Environmental Assessment (SEA) is a procedure to assess environmental consequences of plans, programmes and policies. This report describes how the SEA-approach can be used in the decision-making processes of the Swedish Ministry of Defence. Examples of processes where SEA is applicable are: preparation of directives for govermental official report committees, managing the long-term defence planning, preparation of government bills in general, and the preparation of the recurrent defence policy bill in particular. SEA can facilitate decisions in an environmentally sound direction, but SEA can also be a useful tool to allocate planning resources effectively. However, the environmental issues must be considered in early stages of decision-making processes in order to affect the final result. As for other strategic planning aspects, e.g. juridical or financial, the strategic environmental considerations should be on a central level. Consequently, organisational changes in the defence authorities are probably needed to assure that environmental issues are dealt with on the same level, and within the same organisation, as other strategic issues.