I was stationed twice at the Presidio of San Francisco during the waning years of the Vietnam Conflict - remember, it WAS NOT a war!!! 
During my 1st tour, I was assigned to Headquarters, Sixth US Army and had to, on several occasions go to the airport in an official vehicle to pick up individuals returning from the area. I was spat upon TWICE - not by Hippies but some scumbag students from Berkley. [They wore university sweaters]
I was again stationed there at Letterman Hospital. When the POWs were released and came home, I remember the crowds at the gates chanting how the men who had been locked up in unbelievable conditions and undergoing torture were worthless scum who should still be held for their war crimes in the Hanoi Hilton.

During my 1st tour, I was assigned to Headquarters, Sixth US Army and had to, on several occasions go to the airport in an official vehicle to pick up individuals returning from the area. I was spat upon TWICE - not by Hippies but some scumbag students from Berkley. [They wore university sweaters]
I was again stationed there at Letterman Hospital. When the POWs were released and came home, I remember the crowds at the gates chanting how the men who had been locked up in unbelievable conditions and undergoing torture were worthless scum who should still be held for their war crimes in the Hanoi Hilton.