Scott McKenzie's 1967 rendition of John Phillips' song "San Francisco (Be Sure to Wear Flowers in Your Hair)", which helped to inspire the hippie Summer of Love, became a homecoming song for all Vietnam veterans arriving in San Francisco from 1967 onward. McKenzie has dedicated every American performance of "San Francisco" to Vietnam veterans, and he sang in 2002 at the 20th anniversary of the dedication of the Vietnam Veterans Memorial. Hippie political expression often took the form of "dropping out" of society to implement the changes they sought.