In the next four years, Brazil will host two of the largest global sport events: the Soccer World Cup (2014) and the Summer Olympic Games (2016). To prepare for these events the Brazilian government has created the Integrated Center for Command and Control of Rio de Janeiro (CICC-RJ) to coordinate more than eight organizations including military components (Brazilian Army, Navy, and Air Force), emergency medical services, and other civil government agencies. Currently, representatives of each organization reside inside the CICC-RJ during Joint Operations, and are responsible for identifying and responding to incidents that affect public safety. The main challenge for the CICC-RJ is to ensure assets are effectively and efficiently allocated across the range of security and emergency requirements. Maximizing interoperability among its participating organizations' Command and Control (C2) systems is key to accomplishing CICC-RJ goals. To address this challenge, we are developing an innovative C2 framework for dynamically reallocating resources using negotiation of e-contracts. The C2 framework is implemented by RESTful web services that are designed to interface to the front-end of existing C2 systems. A key aspect of our research is the evaluation of the new framework in real world situations, performed via a C2 Research Testbed, a simulation based environment jointly developed by Brazil and the US to assess the performance of C2 technologies in real-world problems. This paper presents a case study that leverages the C2 Testbed to evaluate the C2 framework via a simulation of the CICC-RJ operations during a complex endeavor (e.g. a flood or riot in Rio) happening at either the World Cup or the Summer Olympics. This work demonstrates how new C2 technologies can be assessed in a realistic operational environment using simulation.