TOMBSTONE — Nelson Mitchell drew cheers and salutes from spectators lining Tombstone’s Allen Street, as he waved to the crowd from the back of an antique convertible. Mitchell served as grand marshal for the eighth annual Salute to the Buffalo Soldiers parade on Saturday, a celebration that commemorated the 150th anniversary of the Buffalo Soldiers and honored Mitchell, the last African American survivor of the attack on Pearl Harbor. “He’s a celebrity,” said Charles Hancock, president of the Southwest Association of Buffalo Soldiers, an organization based out of Sierra Vista. “He was clearly the star attraction for today’s ceremony and...