Advantages

MILES, or Multiple Integrated Laser Engagement System, is a military weapons training system that allows force-on-force training through a system of lasers and sensors. A laser transmitter is fixed to the muzzle of a weapon (typically an M-16 variant), and the sensors are attached to a harness that the soldier wears. The transmitter "fires" when the soldier shoots blanks through the weapon, and hits are recorded by the target's sensors, setting off an audible alarm. The system is fairly easy to use and it allows the use of the troops' own weapons for better familiarization. The range is good (around 300 meters with original MILES gear and about a thousand meters with MILES 2000). Once the initial equipment outlay is done, the only remaining cost (apart from maintenance) is the cost of the blank ammunition.

Disadvantages

MILES gear is expensive and it's basically a military-only system, so it's only made to fit common military weapons. Some disadvantages with the older gear are that a soldier could keep firing even after being "hit" and there was little data actually recorded. MILES 2000 has corrected these problems - it disables the target's weapon after a hit; it also records where the target was hit and by which weapon. MILES 2000 is also reportedly lighter and more "grunt-proof" than its predecessor. Some people report that MILES gear isn't optimal for CQB because of the limited number of sensors and the narrow beam size from the transmitter at close range.