Former Retriever midfielders Terry Kimener and Peet Poillon will be part of the United States national lacrosse team which will conduct an intrasquad scrimmage Sunday at 3 p.m. at the Capital Lacrosse Classic at Landon School in Bethesda. This is the latest step for the U.S. team as it prepares for tryouts next summer before the 2014 Federation of International Lacrosse World Championships in Commerce City, Colo. The scrimmage is also a preview of the Champion Challenge from Jan. 25-27 in Orlando, Fla., when the defending gold medalists will scrimmage at least one NCAA team. This will be Kimener’s first …