To improve reliability of a communication between constituents of individual harnesses by providing a plurality of electric constituents for a mutual communication, and constituting at least part of the constituents by an ultrasonic oscillator, a modulator and an ultrasonic receiver, a demodulator.

The combat harness comprises a main controller 1, two arm wearing harnesses 2, a helmet mounting harness 3, and a laser emitting unit 4. The respective constituents are constituted as a set of the oscillator and the modulator or a set of the receiver and the demodulator. Photodetectors 5 each for responding a wavelength of a beam emitted from the unit 4 are provided at the controller 1 and the harnesses 2, 3. In the case that a certain soldier aims at a target by a hand grip type small arm, operates the unit 4 and generates a modulated laser beam from the unit 4, when the emitted beam is incident to the detectors 5 at the harnesses 2, 3 of an opponent soldier, a 'hit' is displayed.