Captain formally retired from the U.S. military on Saturday . Vice President Obama presided over formal retirement ceremonies . Captain 's wife , Gabrielle Giffords , shot last January , takes part in the ceremony . Washington ( CNN ) -- The ex - astronaut says Giffords told him not to accept failure .
Captain formally retired from the U.S. military on Saturday . Vice President Obama presided over formal retirement ceremonies . Captain 's wife , Gabrielle Giffords , shot last January , takes part in the ceremony . The ex - astronaut says Giffords told him not to accept failure .