In 1973, President Nixon saluted nearly 600 American troops who had been held as prisoners of war in Vietnam. Now, 40 years later, many of those former POW's are reuniting. Ben Tracy reports.

Flash Points: CBS News National Security Correspondent Bob Orr talks with CBS Senior National Security Analyst Juan Zarate about the "more constrained standards" the president outlined regarding the use of unmanned drone strikes on terrorist targets, exploring what constitutes "sufficient information or evidence" to allow the president to authorize a drone strike under the new guidelines.

Flash Points: President Obama declared that the war on terror, "like all wars, must end," during a speech on Thursday, and CBS News Senior National Security Analyst Juan Zarate talks with CBS News National Security Correspondent Bob Orr about what the president meant when he said that and why any adjustments in counterterrorism policy must reflect a changing - but still perilous - threat environment.