New London – More than 430 Connecticut College students marched down the middle of Jean C. Tempel Green Sunday morning and about two hours later walked back through a gauntlet of admiring family and friends as graduates of the Class of 2012.

Louis B. Susman, the U.S. ambassador to the Court of St. James in London, and the father of 1984 graduate Sally Susman, gave the keynote address. He also received an honorary doctorate of humane letters.

The class speaker was Brenner Green, who said when he arrived at Conn College four years ago, he was a son, a brother, a friend, a teammate, a classmate and a house fellow.

“Connecticut College has made me realize I am so much more,’’ he said.

Green, a member of the cross country and track team who estimates he logged 12,000 to 14,000 miles during his college career, told his freshmen teammates that he was gay and asked them to accept him. They did, he said.

Senior Jazmin Long was awarded the Anna Lord Strauss Medal for her work in community service, which included volunteering at the Homeless Hospitality Center in New London and tutoring New London elementary and middle school students.

David Liakos received the Oakes and Louise Ames Prize for his senior honors thesis “Overcoming Transcendence: Charles Taylor and Nihilism.’’

Barbara Kohn, Class of 1972, was awarded the College Medal for her pioneering career in banking.