The UK Ministry Of Defense (MOD) has a vision of providing Mission Training through Distributed Simulation (MTDS) for the air component of the joint battlespace. The MTDS Capability Concept Demonstrator (CCD) programme was funded to determine the key requirements for an MTDS capability and to understand the range of training which could be achieved within such a facility. To achieve this, a demonstrator facility was developed. This facility included fast jet and Airborne Warning and Control System (AWACS) simulators, and an extensive exercise management capability (including virtual role players and Computer Generated Forces). A synthetic air battlespace (air, land and maritime) was created for the exercises and the MTDS CCD facility was linked up to other UK and international facilities, all operating within a shared virtual world. This paper discusses how effectively warfighters' collective training needs can be met (when the trainees are collocated) with differing levels of simulator fidelities. The fast jet simulators used through MTDS CCD consisted of type representative mission simulators, representing four Tornado GR4 and four Typhoon aircraft. Each cockpit could be used within visual systems of three differing fidelity levels. A detailed human factors assessment was conducted to determine the requirements for these simulators and the impact of those requirements on training value. Clear themes supporting the need for a targeted fidelity approach emerged from the data analysis. For instance, it was clear that wraparound visuals would be needed to support Air to Air and Air to Ground training needs. It was also clear that to support a wide range of mission profiles, a sufficient range of weaponry models were needed. Collocation provided the audience with additional benefit of face to face training interactions. In consequence, enhancements to the facility to support future training exercises are being made as a result of these findings.