Flaming Bomb mark

[Incitatus]

Hi all.

I see the flaming bomb mark on various pieces of US militaria. I was wondering what the significance of it is. Also, vcan the letter inside be used to date the object?

I was under the impression that the ordnance mark (crossed cannons) was the standard acceptance mark.

Thoughts, observations etc would be appreciated.

Information

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[bayonet]

"The flaming bomb was the symbol of the Ordnance Corp. Their brass had it as the Infantry had crossed rifles, the Artillery crossed cannons, and Armor a tank. By brass I mean the branch ID brass worn on uniforms."
found this explaination on another site
Carl