Fiscal year ending 6/30/1905, the Chief of Ordnance Report has shown that the Krag bayonet lengthened 6" was adopted for the 1903 Springfield, which had a 6" shorter barrel length than the Krag. Pretty logical, but other designs had been considered. Maybe I was dreaming, but I thought I seen a movie clip of President Theodore Roosevelt "jousting" with somebody using a rod bayonet and managed to break his opponents rod, proving a point (pun intended).

Here is a link from that report, starting on page 75:

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