The Crazy World of Julius Vrooder (1974)

After returning home from the war Vietnam veteran Julius Vrooder resides in a veterans hospital where he has been vaguely diagnosed as psychiatrically impaired Taking the news with an air of initially lighthearted defiance Vrooder escapes and sets up camp under a highway where he builds a paranoiadriven boobytrapped bunker for himself Falling in love with notsobright nurse Zanni Vrooder soon plans to elope with her to a remote Canadian outpost