Walter Hsu says his construction company has handled sensitive federal projects before, including restoration work in the West Wing of the White House, renovation of exhibit space at the Smithsonian museums, and preparation of emergency mailrooms after the Sept. 11, 2001, and anthrax attacks.

But Hsu, 39, the president and owner of Hsu Development Co. of Rockville, says his workers and subcontractors are especially proud of their latest project -- a $3 million contract with the National Park Service to restore the Marine Corps War Memorial and the surrounding park in Arlington.

The site is better known as the Iwo Jima Memorial for its statue of Marines raising an American flag during the legendary World War II island battle in 1945. "We don't do anything on the statue, but we're cleaning the rocks that it stands on," Hsu said. The company is also responsible for replacing sidewalks approaching the memorial and lighting, he said.

"The memorial itself is very much open for visitors throughout," National Park Service spokesman Bill Line said.

Hsu Construction won the contract as a minority-owned business under the Small Business Administration's 8(a) program. Hsu got his interest in federal contracting from his father, who long ran his own construction company that did government work. "I was a laborer on the job sites when I was a kid, digging trenches," he said.

The Marine Corps War Memorial at Arlington depicts the1945 flag raising on Iwo Jima. Hsu Development is to clean the memorial's base and upgrade the surrounding park.