First photo: Subchasers at Queenstown. Photo of chasers, from the collection of a crew member of USS Trippe, operating from Base 6, Queenstown, Ireland. All six chasers served at Plymouth and then at Queenstown during war time operations. SC 272 served in the post-war mine sweeping operations in the North Sea. Courtesy of the National World War One Museum Archives, Kansas City, Missouri.
Roland Green notes that the location is Queenstown, with Haulbowline Island and the British naval base in the background.
Second photo: Another shot at the same location, showing SC 323 and other chasers including SC 222.