Photos by WENDY PIERRO/Acorn Newspapers STRENGTH IN NUMBERS—Above, Marilyn Waidelich of Simi Valley carries a large American flag as she and other walkers leave the Reagan Library and head down Presidential Drive at the start of the third annual Simi Valley Freedom Walk last Thursday. At right, resident Sean Fitzpatrick displays the day's most popular colors: red, white and blue. Marking the seventh anniversary of the attacks of Sept. 11, 2001, the walk was preceded by a flyover by F-18 fighter jets and several guest speakers, including Brad Burlingame, brother of Capt. Charles Burlingame III, the pilot of American Airlines flight 77 when it was hijacked and flown into the Pentagon.