ROCK ISLAND, Illinois, May 21 -- The U.S. Army Sustainment Command issued the following news: By Corinna Baltos, U.S. Army Sustainment Command Did you know that Rock Island Arsenal is the birthplace of the American heavy tank? Between 1919 and 1920 RIA employees built the first American-made heavy tanks, known as the Mark VIII. Now, a little over 100 years later, present-day Arsenal workers have restored one of those tanks, and it is now on display here. "Building this tank showed the capabi  more