Alcatraz Island 6, 2008, the Alcatraz Island Global Peace Center Proposition C failed to pass, with 72% of voters rejecting the proposition. The coastal environment of the San Francisco Bay Area has caused deterioration and corrosion of building materials throughout Alcatraz. Beginning in 2011, the National Park Service began major renovations on the island, including the installation of solar panels on the cell house roof, slope stabilization near the Warden's House and the stabilization and rehabilitation of the outer cell house walls. Recently, Alcatraz has been home to several art installations. The Chinese artist/dissident Ai Weiwei staged an exhibition which explored "questions
Occupation of Alcatraz manhood." Some 50 of the Alcatraz occupiers traveled to the East Bay and began an occupation of an abandoned and dilapidated Nike Missile installation located in the hills behind the community of Kensington in June 1971. This occupation was ended after three days by a combined force of Richmond Police and regular US Army troops from the Presidio of San Francisco. Moreover, the Alcatraz Occupation greatly influenced the American government's decision to end its Indian termination policy and to pass the Indian Self-Determination and Education Assistance Act of 1975. The Alcatraz Occupation led to an annual celebration of the rights