Abstract: The article studies the use of GIS and DB to analyze text and cartographic materials of the information systems “Memory of the People” and “Memorial” and non-digitized materials of the Defense Ministry’s Central Archive to identify soldiers accounting for inexact data and data about those missed in action (after being wounded). The key element of the studies is the adjustment of the Great Patriotic War archival maps of the portal “Memory of the People” and a resource of the American Association of Historians “Gutenberg” to functionally use them in GIS and geoportal. The research methodology is the following techniques: step by step studies starting from a supposition through data search to a hypothesis, its test with the help of specialists and individual search for supporting documents with the aim to further perpetuate the memory of the fallen. The scientific component is the creation of database complexes covering the Great Patriotic War maps and those of the prewar periods as well as geocoded data, the formation of the regiments’ configuration, the cross-matching of data of reports on those lost, documents specifying the losses, memory books, financial statements, etc. The research novelty is the complex use of data of the Great Patriotic War maps, both old and modern ones, as well as data of the database “Memory of the People” and “Memorial” and other documents stored in the Defense Ministry’s Central Archive with the application of GIS, DB and authors’ software for cross-matching. The main conclusion is the efficiency of GIS and DB in search of data of those wounded soldiers who are considered missed in action.