From this web page:
In 1917, the [Laguna Merced Military Reservation] was renamed Fort Funston, after the commander of the army who patrolled the streets after the 1906 earthquake. Fort Funston was de-activated after World War I and re-activated in 1936 as world hostilities flared. During World War II, the army installed mortar and five-inch guns along the lake’s shores, bought 150 acres from the SVWC and expanded the fort. After the war, Fort Funston was declared surplus and given to the City of San Francisco.
A couple of years ago, two unexploded World War II mortar shells were discovered at Fort Funston. More about this in this SF Chronicle article.
