Today, April 30, marks the 50th anniversary of the fall of Sàigòn when thousands of Vietnamese fled political persecution, then millions more in the following years.San Diego was one of the first points of entry for many Vietnamese refugees escaping the communist government.A new KPBS video series, Fall of Sàigòn at 50: Stories of loss, legacy & identity, takes a look back at the events half a century ago, reexamining the historical moment and how it has reverberated across generations in the Vietnamese diaspora, including here in San Diego.Guest:Alexander Nguyen, North County reporter, KPBS