the earth. that is where "endeavour" astronauts completed the final space walk of their mission and the last ever by space shuttle astronauts. they worked on extending the reach of the space shuttle's robotic arm. a parade of u.s. navy ships sailing up the river marks the start of fleet week in new york. it is a truibute to u.s. armed service members. fleet weekends on memorial day with a military flyover honoring those who have lost their lives in service. and in virginia, members of the army's third infantry honor america's fallen heroes. flags are placed throughout arlington national cemetery. it has been held the past 40 years before memorial day weekend. well, this weekend americans remember our fallen heroes. but for thousands of widows across the country, every day is a memorial day. taren davis lost her husband at 21 and built a sisterhood for