SAN FRANCISCO — In what may have been the final pass of a United States battleship under the Golden Gate Bridge occurred Saturday.At approximately 3:30 p.m., the USS Iowa (BB-61) passed under the Golden Gate Bridge to the open sea of the Pacific Ocean. The battleship was not under its own power, being towed behind a sea-going tug for its final journey to Southern California and the Port of Los Angeles in San Pedro at Berth 87. Once there, it will be transformed into an interactive naval museum.The battleship was the lead ship built in the “fast battleship” class.