penn261
https://global.upenn.edu/penn-biden-center/our-mission-statement
says beau was in the 261st signal brigade
In 1977, Vice President Biden married Jill Jacobs. Jill Biden, who holds a Doctorate in Education, is a life-long educator and currently teaches at a community college in Northern Virginia. The Vice President’s son, Beau, was Delaware's Attorney General from 2007-2015 and a Major in the 261st Signal Brigade of the Delaware National Guard. He was deployed to Iraq in 2008-2009. Beau passed away in 2015 after battling brain cancer with the same integrity, courage, and strength he demonstrated every day of his life. The Vice President’s second son, Hunter, is an attorney who manages a private equity firm in Washington, D.C. His daughter Ashley is a social worker and Executive Director of the Delaware Center for Justice. Vice President Biden has five grandchildren: Naomi, Finnegan, Roberta Mabel ("Maisy"), Natalie, and Robert Hunter.