In Ancient Rome, the Roman Legions were renowned for their discipline and fighting skill with the Gladius (Roman short sword). After conquering most of the known world and serving Rome faithfully for many years, on retirement, Legionnaires were usually given a plot of land, a pension, and they were allowed to keep their trusty Gladius, as a sign of honor and to defend their holding.
In my mind, the M16s I served with in the US Army were like the swords the Legionnaires fought with, state of the art in their day - the M16 is the sword of our age.
I have always felt our military should present retiring soldiers with a weapon like the one they served with as a reward for years of faithful service.
Of course, this does not happen. But in owning my AR15, with which I am intimately familiar, I feel like I have kept my "sword" after serving my country honorably. This is why I love my AR15, and why I believe it in turn still serves me well.
DR