As stated in the above work, the 12th, 13th, 14th, and 17th Engineer Regiments paraded through London on August 15, 1917. Not only were they the first U.S. troops to arrive, but a big deal was made of the claim that it was the first time since William the Conqueror that an organzied body of foreign troops had been in London. Even the king and queen participated in the festivities.
About halfway down the line a good view of a canteen clearly shows '12 something.' Maybe 'B' maybe 'H'? At any rate, an easy ID when combined with the parade details.

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