William A. Young
Photo found in the Gold Book on GCI, labeled "Mr. & Mrs. Will Young".
On the right arm of his uniform you can see a life ring with two crossed oars, labeled "US LSS". On the left arm the number "3" appears (or perhaps it's the first digit of a larger number, like "30".) This probably indicates that William was a member of the United States Life Saving Station on Islesford.
In L.V. Stanley's Cemeteries of Great Cranberry Island, the only mention of a "William Young" is William W. Young, second husband of Hannah Caroline (Stanley) Ladd-Young. In Hugh Dwelley's Burying Grounds at Islesford, there are two William Youngs mentioned: William W. (1836-1924) and William A. (1869-1946), his son, both buried in the Stanley-Gilley Cemetery on Islesford. Bradley Bryant of Islesford informs me that this photo is actually William A. Young; he knows this as he is related to Young and has other similar photos.