Long winded? Heavens no! That's a lot better than the one sentence "Can you help me find my daddy, he fought in Europe" questions we sometimes get.

This is an interesting set of questions you have posed and I don't know the answer to them myself, but I am willing to bet someone here does or can find what you are looking for.

Do you have any other information, pictures, etc?

Did you do a Google search for any of the phrases (First Motion Picture Unit, Combat Camera Units)? I did and found several web pages that looked to have a good deal of information in them.

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Best Regards,
JW