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

Context paragraphs:
Tachibana Dōsetsu: Tachibana Dōsetsu (立花 道雪 , April 22, 1513 – November 2, 1585) , born Betsugi Akitsura (戸次鑑連 ) , also as Bekki Akitsura, and Bekki Dōsetsu, was a Japanese samurai of the Sengoku period who served the Ōtomo clan.  He was the father of Tachibana Ginchiyo and adopted father of Tachibana Muneshige.

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.

Bhuvanaikabahu VI of Kotte: Bhuvanekabahu VI (Sapumal Kumaraya) (Sinhala:සපුමල් කුමාරයා, Tamil: செண்பகப் பெருமாள்) or Chempaha Perumal (died 1480) was by self admission an adopted son of Parakramabâhu VI whose principal achievement was the conquest of Jaffna Kingdom in the year 1447 or 1450.  He ruled the Kingdom for 17 years when he was apparently summoned to the south after the demise of his adopted father.  According to a primary source "Rajavaliya", he killed the grand son of Parakrama Bahu VI namely Vira Parakrama Bahu or Jaya Bahu (1468 – c. 1470) but Do Couto, however, who was well-informed, says after a few years' reign the king died and his half-witted son was put on the throne by his aunt, who two years later finding herself unable to rule sent for Sapumal Kumaraya from Jaffna.

Kujō Fusazane: Kujō Fusazane (九条 房実 , 1290–1327) , son of regent Tadanori and adopted son of Moronori, was a "kugyō" or Japanese court noble of the Kamakura period (1185–1333).  He held a regent position kampaku from 1323 to 1324.  A daughter of Nijō Kanemoto was one of his wives with whom he adopted Michinori, son of his adopted father Moronori.

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.

Problem Child 2: Problem Child 2 is a 1991 American comedy film and a sequel to the 1990 film "Problem Child"; a continuation of the exploits of Junior (Michael Oliver), an adopted orphan boy who deliberately wreaks comedic havoc everywhere he goes.  John Ritter returns as Junior's adopted father, Ben Healy.  Amy Yasbeck, who played Ben's wife, Flo, in the first movie, also returns, as school nurse Annie Young.  It was produced by producer Robert Simonds, who also produced the first one.  It was rated PG-13, unlike its predecessor, which was rated PG.

Shane Shamrock: Brian Stephen Howser (February 8, 1975 – August 18, 1998) was an American professional wrestler best known for wrestling in Maryland Championship Wrestling.  In the promotion, he was the first and only wrestler to win the Light Heavyweight Championship and was nicknamed "The Lifetime MCW Light Heavyweight Champion" in tribute to his death.  Each year, the Shane Shamrock Memorial Cup is held as a tribute to him.  Despite sharing an in-ring last name, he is not related to Ken Shamrock (who was born Kenneth Wayne Kilpatrick, although he adopted the surname "Shamrock" after his adopted father, Bob Shamrock).

Thadeus Nguyễn Văn Lý: Father Thadeus Nguyễn Văn Lý (born 15 May 1946) is a Vietnamese Roman Catholic priest and dissident involved in many pro-democracy movements, for which he was imprisoned for a total of almost 15 years.  For his ongoing imprisonment and continuous non-violent protest, Amnesty International adopted Father Lý in December 1983 as a prisoner of conscience.  Most recently, his support for the Bloc 8406 manifesto has led to his sentence on 30 March 2007, for an additional eight years in prison, where he was released and then returned in 2011.

Philippus (son of Philip V): Philippus the son of Philip V, half-brother of Perseus Antigonid King of Macedon.  He was adopted by his brother as his son.  Even after the birth of the king's son, Alexander, Perseus treated him as his heir to the throne.  Together they surrendered to the Romans ending the Third Macedonian War.  He was led in triumph before the car of Lucius Aemilius Paullus and afterwards consigned to captivity at Alba Fucens, where he survived his adopted father but a short time.  He was only eighteen years old at the time of his death.

Sumako Matsui: Sumako Matsui (松井 須磨子 , Matsui Sumako , November 1, 1886 – January 5, 1919) was a Japanese actress and singer.  Born as Masako Kobayashi in Matsushiro, Nagano, Nagano Prefecture as the fifth daughter and last of nine children of Tohta Kobayashi, she was adopted by the Hasegawa family in Ueda at the age of six and in 1900 graduated Ueda school.  She had to return to her birth family after her adopted father died, however in the year of her return, her natural father also died.  At the age of 17 she moved to Tokyo.

Supporting paragraphs: Robert Tree Cody Iron Eyes Cody
Answer: Keep America Beautiful