Marines who plan to be in Washington, D.C. for Memorial Day weekend won’t want to miss the parade downtown on Monday, May 31. This year’s National Memorial Day Parade, touted by organizers as the largest Memorial Day parade in the nation, will pay special tribute to the Marine Corps. Retired Gen. Peter Pace, the only Marine to serve as chairman of the Joint Chiefs of Staff, will lead the tribute in his temporary role for the day as parade Grand Marshal. Pro-military dudes like Gary Sinise and Joe Mantegna will be there, along with former Marine drill instructor and actor…