ussdelaware

"The sixth USS Delaware (BB-28) of the United States Navy was a battleship launched in 1909 and scrapped in 1924, the lead ship of the Delaware class." en.wikipedia.org/wiki/USS_Delaware_(BB-28)

Possibly at the Naval Review 14 October 1912 in New York, where a couple of other photos of US warships in the Bain collection were taken. Delaware participated in that review--see the Wikipedia article above. There is a Naval Historical Center page on the Mayflower: USS Mayflower (1898-1931, later PY-1) The ship has a long and fascinating history--see the Wikipedia article. According to that article, the Mayflower was the Presidential yacht, so it seems likely this was the naval review mentioned above. I find it amusing that the designation was PY-1, the equivalent of today's "Air Force 1".

It seems that the Delaware was not in the Great White Fleet (see below) so maybe this is a different event. en.wikipedia.org/wiki/Great_White_Fleet

This Delaware is a Dreadnaught (all big gun battleship). So would have been after the Great White Fleet.

"The sixth USS Delaware (BB-28) of the United States Navy was a battleship launched in 1909 and scrapped in 1924, the lead ship of the Delaware class." en.wikipedia.org/wiki/USS_Delaware_(BB-28)