http://www.digitaljournal.com/article/118605

What do the markings mean on bombs and bullets?

Posted Feb 18, 2007 by Lemery

http://www.thestar.com/sciencetech/article/182984

"For inventory and quality control. When a bullet, explosive, or any kind of ammunition is manufactured, it may be marked with a unique serial number and date of manufacture. (A bomb may also include information indicating which factory produced it.) T...
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"For inventory and quality control. When a bullet, explosive, or any kind of ammunition is manufactured, it may be marked with a unique serial number and date of manufacture. (A bomb may also include information indicating which factory produced it.) This simplifies the process of tracking missing or damaged munitions.
For example, if a bullet misfires, the military can use its markings to identify and scrap the entire lot it came from. The date of manufacture is important because the components in ammunition begin to degrade and become unreliable after about 15 years."
Well now you know :)
I linked the full article, if you are still interested continue reading.
Until next time,
Lemery