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In order to simulate anticipated summer heat stress, we tested the gear in a sauna of approx. 150-170F (the thermometer broke at 140+ F (maximum thermometer calibrated scale 140F)). The temperature was hot enough to make metal burn exposed skin. We conducted the test for 30 minutes, which included full body armor/kevlar, and physical exertion. To simulate the physical activity of soldier patrols we did push ups (in armor) and squats/knee bends. Despite the searing heat, the cooling gear was comfortable. The simulation was halted after 30min due accomplishing the simulation objective. Subsequent inspection of the cooling gear revealed the phase change packs in the helmet had expended approximately 50% of their charge, while the packs in the vest still retained 70% of their original charge. The evaporative cooling portion remained close to full charge, as anticipated. This demonstrates the gear will effectively cool a soldier during the intense Iraq/Kuwait summer, and preserve physical capabilities. Use of included swap out packs and recommended cooling bag would allow for extension of maximal cooling for prolonged periods of time, and should be considered for long missions. The Modular Combat Cooling System (MCCS) has been redesigned for OIF 2005 to reduce percieved bulk by less than 40% from the 2004 design, and to allow packs to be removed or exchanged in less than 30 seconds, while on patrol, without removing the interceptor OTV. Hope this helps clarify the system's capabilities. We are happy to accept further testing recommendations. More feedback from Iraq/Kuwait will be posted, when temperatures rise closer to summer peaks.