Warum sagen Soldaten 2x Sir?

[ThunderStorm]

Wieso sagen die Soldaten immer 2x Sir? Also z.B. Sir Ja Sir? Normal sagt man es doch nur 1x am Ende?
Ich schaue grade Full Metal Jacket auf RTL2.

[Waterpolo]

Why do people in military organisations say 'Sir, yes sir'? - Yahoo! Clever

That used to occur in basic training. As a boot you're the lowest form of life on earth. You're fit to be looked at but not to look upon anybody but your fellow recruits. So the first word out of your mouth when speaking to superiors was always sir, it's a show of respect and an acknowledgment of your lowliness.

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