Serving on board the U.S.S. Kearsarge, at Hampton Roads, Va., 26 October 1881, Sweeney jumped overboard and assisted in saving from drowning a shipmate who had fallen overboard into a strongly running tide.
Serving on board the U.S.S. Jamestown, at the Navy Yard New York, 20 December 1883, Sweeney rescued from drowning A. A. George, who had fallen overboard from that vessel.