In this paper we introduce how to use Dynamic Electronic Institutions for Operations Other Than War simulation. OOTW involves different types of humanitarian aid operations, where a large number of different agents have to collaborate in fast-changing environments. In our opinion Dynamic Electronic Institutions arise from the convergence of two research areas: electronic institutions and coalition formation. We believe that this research topic is well suited to OOTW requirements: decentralised control, knowledge management, short-term associations, flexible negotiations, etc. In this paper we comment on different approaches for OOTW simulation, we present a brief summary of our previous work on dynamic institutions, we explain our ideas on how to use dynamic institutions for OOTW simulation, and we show our first experiments and results in this direction.