CPV code 72231000 designates Development of software for military applications in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
72231000 is a leaf code — the most specific level of its branch — so it can be used directly as the main CPV code of a contract notice. If it does not quite fit, check the neighbouring codes under 72230000 (Custom software development services).