Look at it this way: The two large photos have something specific in common. The small photo is a clue to identifying what that something is. The actual number of troops in the gun crew is not significant.
I still got nuthin'. Perhaps my poor attention in math classes is holding me up here. Only thing I came up with is 2 gun barrels, 2 rotor heads. And I'm pretty sure that has nothing to do with Mersenne. Thought maybe the 46 was a Mersenne, but it ain't. So I'll just sit here and look stoopid for a bit. :D
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M---- M--------
and
M----- M------
which rhyme/are quite similar...
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However, you've clearly gotten one relevant piece of information.
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The portrait is actually a clue to what's important about the other two.
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