One of the Iraq War’s hardest hit units, which lost 22 Marines and a corpsman on a single deployment, is being commemorated by a temporary exhibit at the National Museum of the Marine Corps in Triangle, Va. The exhibit, which commemorates the dead of Columbus, Ohio-based Lima Company, 3rd Battalion, 25th Marines — known as “Lucky Lima” when it deployed to Iraq in 2005 — will be open to the public from Feb. 20 through March 3. It consists of oil paintings of each of the 23 casualties created by Columbus-based artist Anita Miller. Together they comprise a touring…