WASHINGTON, DC—Across the U.S., ceremonies have already begun to commemorate the 30th anniversary of 1973. "No one who lived through 1973 can ever forget it," said singer Tony Orlando, unveiling a plaque Monday on the National Mall reading "1973: 1973-2003." "From Richard Nixon's second inauguration to Billie Jean King's defeat of Bobby Riggs, 1973 was a special year that will be celebrated all year long." The U.S. Postal Service announced plans Tuesday to observe the milestone with a paisley stamp trumpeting "30 Years Of 1973."