Stick It in Your Ear (1970)

A young man named David wakes up in a destroyed urban church and then embarks on a psychedelic journey of finding out who he is and his role in the world. David's past is slowly revealed on his surreal journey through an urban city of drugs, hippies, sex and flashbacks to his past. David is revealed to be a Vietnam veteran traumatized by the war who is currently employed by a fellow vet-turned-pornographer named Nick to assassinate an anti-war activist leading David to question his own morals.