Background: The Swedish Armed Forces are in a new suit concerning peacekeeping missions abroad. In the future the Forces may have less Medical specialists that are conducive to the use of more Technical supporting system. Here we suggest a Mixed Reality supporting system for convoluted medicine technical performance. Mixed Reality involves the merging of real and virtual worlds. The user utilizes a head mounted or a handheld visual display presenting texts, virtual objects, animation sequences, audio and environmental features as incorporated into the real environments. Summary of work: We conducted an evaluation study in which ten participants used Mixed Reality technology, compared to written instructions with a picture as support for executing tasks. The tasks were to perform the procedures of ”power up” and to unitize a ventilator circuit assembly for the LSTAT® (Life Support for Trauma And Transport, a Platform for medical evacuation of a patient/wounded soldier.) Summary of results: The Mixed Reality technology was in general considered beneficial and there were favourable reactions in these tasks, compared to the written instructions.