The men and women who built Hoover Dam were honored for enduring hardships so that all of America might prosper, and they contributed this memorial for the fiftieth anniversary of the dam's dedication on September 30, 1985. Among the project's notable contributions to the construction industry was the hard hat, which became mandatory equipment at Hoover Dam under a strong emphasis on safety. At the dam's dedication on September 30, 1935, President Franklin Delano Roosevelt hailed Boulder Dam as an engineering victory of the first order and a great achievement of American resourcefulness, skill, and determination, congratulating its builders on behalf of the nation.