With this paper we will be exploring the usage of Collaborative Tagging in administrative Information Systems of the Estonian Defence Forces (EDF), which is currently using Information Systems (IS) mainly for administrative purposes. The potentials of using Collaborative Tagging in Inter- and Intra-organizational settings for knowledge management and sharing are not well understood at present. Moreover, military applications of Collaborative Tagging have not been reported. The paper will therefore explore some initial use cases of the use of Collaborative Tagging and from these identify potentials and threats. Does collaborative tagging in semantic environment help us better organize knowledge in the EDF Information Systems? Semantics can foster to gain individual knowledge in the community.