Today (May 28, 2012) marks Memorial Day, during which we remember the men and women who sacrificed their lives while serving in the United States Armed Forces. Among those paying tribute to America's fallen soldiers are rock acts such as Shinedown, Tommy Lee and Slash. Those rockers, as well as Papa Roach, 3 Doors Down, Nickelback and others, took time out today to acknowledge Memorial Day via Twitter. Read their tributes in the following list of Memorial Day Tweets: