ASHINGTON, March 29 - Sgt. First Class Paul R. Smith, killed nearly two years ago defending his vastly outnumbered Army unit in a fierce battle with elite Iraqi troops for control of Baghdad's airport, will receive the Medal of Honor, the nation's highest military award, administration officials said Tuesday.No soldier who served in Afghanistan or Iraq after the Sept. 11 attacks has yet received the medal. The last conflict to produce a Medal of Honor recipient was in Mogadishu, Somalia, in 1993; two soldiers were awarded the medal posthumously for actions there, later depicted in the movie "Black Hawk Down."Sergeant...