"... notable monument in Fort Rosecrans National Cemetery commemorates the deaths of 62 sailors in a boiler explosion aboard the USS Bennington. The Bennington, which had just returned from maneuvers in the Pacific, was anchored in San Diego Harbor. On July 21, 1905, the crew was ordered to depart in search for the USS Wyoming, which had lost a propeller at sea. At approximately 10:30 a.m., an explosion in the boiler room ripped through the ship, killing and wounding the majority of the crew. Two days later the remains of soldiers and sailors were brought to the post cemetery and interred in an area known as Bennington Plot."
Here is a picture of the monument from the southeast:
The plaque on the north side of the monument:
The white gravestones nearest the monument are for the sailors who lost their lives in the explosion.
The web site of the San Diego Chapter of the Sons of the American Revolution (SAR) shows more photos of the history of the monument, and the ceremonies in 2008 that honored the dead buried there.