The present invention provides 
system of active uniform and 
base station for sensing an aspect of the wearers environment or 
physiology. Active uniform (1) is comprised of uniform (3), electronic sensors (40) for sensing an aspect of the wearer's environment or of the wearer's 
physiology and an active tag (10). The 
system of active uniform (1) and 
base station (2) is used to collect data from wearers of the at least one item of active uniform which allows an assessment of the health of the wearer where said 
health assessment is subsequently used to enhance the 
survivability of the wearer. The active tag contains various components that allow it to communicate with the 
base station (2) including (i) sensor interface (80) for 
interfacing electronic sensors (40) to the active tag, (ii) a 
microcontroller (70), (iii) a 
data store (60) including 
flash memory, (iv) 
radio frequency interface (110), (v) at least one 
tag antenna (120) and (vi) a battery (100) and 
power management unit (90). The sensors (40) and active tag (10) are adapted to be retained on or in the item of uniform (3) such that the active uniform (1) is able to be washed without removing the electronic sensors (40) or the active tag (10). 
Base station (2) comprises base 
station antenna (20), base 
station transceiver (320) and 
data processing apparatus (340) connected to the base 
station transceiver, which is adapted to receive and store data transmitted by the active tag of the active uniform, including at least, sensor and identification data.