Question: What was Robert Tree Cody's adopted father's most prominent PSA role?

full_context: Document 1: Floyd Westerman: Floyd Westerman, also known as Kanghi Duta i.e. "Red Crow" in Dakota (August 17, 1936 – December 13, 2007), was a Sioux musician, political activist, and actor. After establishing a career as a country music singer, later in his life, he became a leading actor depicting Native Americans in American films and television. He is sometimes credited simply as Floyd Westerman. He worked as a political activist for Native American causes.
Document 2: Terrence Cody: Terrence Bernard Cody, Jr. (born June 28, 1988) is a former American football defensive tackle. He played college football for the University of Alabama. He was selected by the Baltimore Ravens in the second round of the 2010 NFL Draft.
Document 3: Jim Boyd (musician): Jim Boyd (1956 – June 22, 2016) was a Native American singer-songwriter, actor, and member of The Jim Boyd Band on the Colville Indian Reservation in Washington. Boyd has performed in several groups, including XIT, Greywolf, and Winterhawk. Boyd sang four songs with lyrics by Sherman Alexie on the soundtrack for the 1998 movie "Smoke Signals", and also appeared in Alexie's "The Business of Fancydancing".
Document 4: Ryan Alosio: Ryan Alosio is an American actor and visual artist who holds citizenship in both Ireland and the U.S. The son of an Irish mother and Italian father, Alosio spent eight years in boarding schools, three in military academy. He graduated with honors from the Interlochen Arts Academy and continued his studies at Northwestern University in Chicago, studying film and journalism and New York University where he majored in dramatic writing in the Tisch School of the Arts. He currently plays 'Miles Farber' on the Jim Carrey produced Showtime series, "I'm Dying Up Here", and has portrayed an eclectic mix of characters in stage, film and television productions opposite such actors as Hugh Laurie, Elijah Wood, Jeff Goldblum, Kiefer Sutherland, Judith Light, Gary Sinise, John Hawkes, Patrick Dempsey, and Jason Alexander. Alosio appears in and voices multiple national Ad campaigns for Dodge, Mountain Dew, Carl's Jr. and Nissan, as well as animated characters for Warner Bros., Honda, Japanese Anime, Cartoon Network and multiple industry leading gaming franchises such as game of the year and BAFTA Award winning "Fallout 4", "Titanfall 2", Marvel's "The Amazing Spiderman 2", and "Rise of the Tomb Raider". Alosio is a gallery shown and sold abstract painter and published photographer with work featured in noted publications such as Rizzoli International's "Modern Americana", architectural publication "Modern Magazine" and "The New York Times Magazine". He was the singer/songwriter of the alt-rock band, "blackradio", performing throughout Los Angeles at The Viper Room, The Hard Rock, The Mint and The Los Angeles Music Awards. Alosio passionately rides and has built and customized multiple vintage motorcycles and award winning classic muscle cars. He is an animal lover and environmentalist and makes his home in Los Angeles, California.
Document 5: Cody Walker (actor): Cody Beau Walker (born June 13, 1988) is an American actor. He is the brother of the deceased Paul Walker, and helped complete his final scenes in "Furious 7" (2015). He made his acting debut in "Abandoned Mine" (2013). He went on to appear in "" (2016), and went on to star in the television programme "In the Rough". He will make his lead acting debut in "The Tunche" (2017).
Document 6: Vito Scotti: Vito Giusto Scotti (January 26, 1918 – June 5, 1996) was a prominent American character actor of Italian descent, who played many roles, primarily from the late 1930s to the mid-1990s on Broadway, films and later television. He was known as a man of a thousand faces, for his ability to assume so many divergent roles in more than 200 screen appearances, in a career spanning 50 years. He was known for his resourceful portrayals of various ethnic types. Born of Italian heritage, he was seen playing everything from a Mexican bandit, to a Russian doctor, to a Japanese sailor, to an Indian travel agent.
Document 7: Robert Tree Cody: Robert Tree Cody (born April 20, 1951) is a Native American musician, dancer, and educator. He graduated from John Marshall High School in 1969. Robert is an adopted son of Hollywood actor Iron Eyes Cody.
Document 8: Cody B. Ware: Cody Morgan Verdecias (born September 4,1988), better known by his stage name Cody B. Ware is an American Rapper, Songwriter and A&R from Queens, New York who works on hip-hop and black metal. He is a member of the Queens-Based music collective World's Fair. Verdecias is a child of interracial parents and he is of half-Afro-Rican and half-Jewish descent. According to Verdecias, Bad Rabbits "blessed" him with the stage name Cody B. Ware after Retired Pro Wrestler Koko B. Ware. Verdecias says that growing up, his musical influences in hip-hop were Nas, Andre 3000, Big Pun, Khujo Goodie of Goodie Mob and he was also inspired by rock artists such as Daryl Palumbo of Glassjaw and Jacob Bannon of Converge.
Document 9: Clint Eastwood: Clinton Eastwood Jr. (born May 31, 1930) is an American actor, filmmaker, musician, and political figure. After achieving success in the Western TV series "Rawhide", he rose to international fame with his role as the Man with No Name in Sergio Leone's "Dollars" Trilogy of Spaghetti Westerns during the 1960s, and as antihero cop Harry Callahan in the five "Dirty Harry" films throughout the 1970s and 1980s. These roles, among others, have made Eastwood an enduring cultural icon of masculinity.
Document 10: Cody Lundin: Cody Lundin (born March 15, 1967) is a survival instructor at the Aboriginal Living Skills School in Prescott, Arizona, which he founded in 1991. There he teaches modern wilderness survival skills, primitive living skills, urban preparedness, and homesteading. Lundin was also a former co-host of Discovery Channel's reality television series, "Dual Survival".
Document 11: Nathan Cody: Nathan Cody is a Los Angeles based voice artist and radio personality. He is best known for his many commercials produced for Entercom and Clearchannel, as a radio personality on the Top 40 station KDND 107.9 "The End," and for his work with Independent record label Quasitone Productions.
Document 12: Bud Spencer: Carlo Pedersoli (31 October 1929 – 27 June 2016), professionally known as Bud Spencer, was an Italian actor, professional swimmer and water polo player. He is known for action-comedy roles with his long-time film partner Terence Hill. The duo "garnered world acclaim and attracted millions to theater seats". Spencer and Hill appeared in, produced and directed over 20 films together.
Document 13: Robert Lee (musician): Lee Jun-fai (; born 16 December 1948), known professionally as Robert Lee, is a Hong Kong musician and younger brother of martial artist legend Bruce Lee, the brother-in-law of Linda Lee Caldwell, and also the paternal uncle of Brandon Lee and Shannon Lee.
Document 14: Adam Beach: Adam Beach (born November 11, 1972) is a Saulteaux actor. He is best known for his roles as Victor in "Smoke Signals", Frank Fencepost in "Dance Me Outside", Tommy in "Walker, Texas Ranger", Kickin' Wing in "Joe Dirt", U.S. Marine Corporal, Ira Hayes in "Flags of Our Fathers", Private Ben Yazzie in "Windtalkers", Dr. Charles Eastman (Ohiyesa) in "Bury My Heart at Wounded Knee", in "", and Officer Jim Chee in the film adaptations of "Skinwalkers", "Coyote Waits", and "A Thief of Time". He starred in the Canadian 2012-2014 series "Arctic Air", and played Slipknot in the 2016 film "Suicide Squad". He also played Squanto in Disney's "Squanto, a Warrior's Tale."
Document 15: Iron Eyes Cody: Iron Eyes Cody (born Espera Oscar de Corti April 3, 1904 – January 4, 1999) was an Italian-American actor. He portrayed Native Americans in Hollywood films. He also played a Native American shedding a tear about litter in one of the country's most well-known television PSAs, "Keep America Beautiful". In 1996, Cody's half-sister said that he was of Italian ancestry, but he denied it.
ground_truth: Keep America Beautiful