By Gerry Condon 
As a Vietnam era veteran, I paid close attention to Defense Secretary Chuck Hagel's Veterans Day speech, delivered at the Vietnam Veterans Memorial Wall. Secretary Hagel, a Vietnam combat veteran, declared that we must learn the lessons of past wars, and not commit U.S. troops to unpopular, unwinnable conflicts. He purportedly referred to the Vietnam War, but he could just as easily have been describing the U.S. occupations of Iraq and Afghanistan.