In the military, there are many dangerous, difficult working conditions. Sometimes soldiers have to cope with the enemy and cannot sleep all the day because of overnight training or operation. So the health state of serviceperson has been the main concern of the commander. Despite the importance, to monitor the health condition of the serviceperson without influence of daily schedule or combat situation is very difficult, because there are so many artifact sources in the field. And the devices which monitor the subjects need the additional work and subjects need to be very careful doing something with devices. We intend to develop the system that can monitor the soldier's biomedical signal unconstrainedly. In this paper we introduce the prototype of our helmet based system. This system measured the ECG, EOG and Eye Blink successfully.