This is a military device that serves several important roles:
1. It helps prevent "Friendly fire incidents".
2. It allows soldiers an easy "highly encrypted" and secure method of keeping track of where comrades are.
3. It helps locate and identify the enemy at night, and at great range.
4. It is "autonomous", allowing an individual platoon or battalion to keep track of its members, independently from larger scale electronic idenfiication and location systems.
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