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USS Mayflower (PY-1) (later as USCG Mayflower (WPG-183)) was the second ship in the United States Navy to have that name. Mayflower — a luxurious steam yacht built in 1896 by J. and G. Thompson, Clydebank, Scotland — was purchased by the Navy from the estate of Ogden Goelet and commissioned at New York Navy Yard on 24 March 1898, Commander M. R. S. McKensie in command. en.wikipedia.org/wiki/USS_Mayflower_(PY-1)

"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".

USS Mayflower (PY-1) Patrol Yacht - 1. Used as Presidential Yacht intermittantly from 25 July 1905 to 22 March 1929 Ship's history here: www.ibiblio.org/hyperwar/USN/ships/dafs/WPG/wpg183.html

www.geocities.com/scs028a/1912List.html

a completely documented account of this! Monday October 14, 1912, query.nytimes.com/mem/archive-free/pdf?res=9D02E4DD133CE6...

USS Mayflower (PY-1) (later as USCG Mayflower (WPG-183)) was the second ship in the United States Navy to have that name. Mayflower — a luxurious steam yacht built in 1896 by J. and G. Thompson, Clydebank, Scotland — was purchased by the Navy from the estate of Ogden Goelet and commissioned at New York Navy Yard on 24 March 1898, Commander M. R. S. McKensie in command. en.wikipedia.org/wiki/USS_Mayflower_(PY-1)