Coronado is home to many military families—including about 75 percent of students at Strand Elementary. So Thursday’s funeral procession for Lt. Christopher Mosko was especially meaningful. A charter plane brought Mosko, who was killed last month in Afghanistan, to North Island Naval Air Station. But a larger question looms: What does Mosko’s ultimate sacrifice mean? One poll says only 27 percent of Americans back the Afghanistan war. Osama bin Laden once launched attacks from that country. Now he is gone. Should U.S. troops be, too?