The USS Markab (AD-21) was a Hamul-class destroyer tender launched on December 21, 1940. It was commissioned on June 15, the following year under Comdr. Allen D. Brown’s command with the hull number AD-21 and served in the U.S. Navy for 18 years until it was decommissioned on December 19, 1969. During its activities, the ship carried a complement of 864 people on board and had its main missions in Hampton Roads, Pearl Harbor, Jersey City, Yokosuka, Sasebo, Eniwetok, Majuro, Ulithi, Okinawa and Shanghai. After decommissioning, the ship was struck from the Navy List on September 1, 1976, and sold for scrapping in 1977. Asbestos has been classified as a known human carcinogen by the U.S. Environmental Protection Agency, the U.S. Department of Health and Human Services, and the International Agency for Research on Cancer. When the asbestos-containing products are disturbed, tiny fibers are released into the air. When asbestos fibers are breathed in, they become forever trapped in the lungs. Over time, these fibers can cause irritation, scarring and inflammation, which can affect breathing and lead to serious health problems.