You guys are from different branches of the military. How do you know each other?
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NakoolHow do you know one another ?Why do you think it should be 'one another', Nakool?
NakoolAs per my understanding, we use 'each other' for two persons and 'one another' for more than two.That is the prescription, but it is seldom followed by native speakers, who tend to use them with an individual preference.