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Sorry, there is no sequel. There was a Medal of Honor: Rising Sun 2 in development, but it was canceled to the poor criticism of the first game.
No, but you can in the multiplayer mode of MOH Frontline, the game before Rising Sun.
The address of the Rising Sun Branch is: 111 Colonial Way, Rising Sun, 21911 2283
Right at the end of the game when your defeating the main boss.
The Rising Sun was created in 2001.