Our story about the group installing a gravestone for Maj. Samuel Nicholas, first commandant of the Marine Corps, got tons of great attention online, much of it from people who know their Marine Corps history forward and backward and love it. I hope some of those history-lovers will be able to make it to Philadelphia June 1 for the headstone’s installation ceremony, which organizers say will draw a crowd of “between 50 and 10,000.” That said, the history buffs did raise a few issues that could not go unaddressed in order to keep the historical record intact. The first note is…