Who will planet the flags on the Moon or Mars ?

A look at NASA's newest astronauts:

_ Joseph M. Acaba, mission specialist-educator. Acaba, a middle school science and math teacher in Dunnellon, Fla., has two degrees in geology. He worked as a hydrologist before becoming a teacher and spent two years in the Peace Corps in the Dominican Republic, where he taught people about the environment. The 38-year-old, who was born in California, has three children.
_ Richard R. Arnold II, mission specialist-educator. Arnold, a math and science teacher who has taught in places ranging from Morocco to Romania, has a master's degree from the University of Maryland. He most recently taught math and science at the American International School in Bucharest, Romania. The 42-year-old is married with two daughters.
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_ Randolph J. Bresnik, pilot. Bresnik, a U.S. Marine Corps test pilot based in San Diego, is approaching 3,000 flight hours, including a recent tour in Iraq. Bresnik, 38, grew up in California and has a master's degree in aviation systems from the University of Tennessee at Knoxville.
_ Christopher J. Cassidy, mission specialist. Cassidy, a Navy SEAL, recently returned from a second tour in Afghanistan. He has a master's degree in ocean engineering from the Massachusetts Institute of Technology. The 35-year-old grew up in Maine. He is married with three children.
_ James P. Dutton, pilot. Dutton, a major in the U.S. Air Force based at Edwards Air Force Base in California, flew combat air patrols over northern Iraq during the 1990s. He has degrees from the U.S. Air Force Academy and the University of Washington. The 37-year-old, who grew up in Oregon and first wanted to become an astronaut in middle school, is married with three sons....