Bridget Sullivan (United States Army, Callsign "Red Cap") is a United States Army soldier who is portrayed on "The Unit" by actress Nicole Steinwedell. Sullivan joins the Unit during the events of the Season 4 episode "Sacrifice". While undercover with an arms dealer for 18 months, Bridget was instrumental in the Units success in eliminating the dealers threat. En route back to the United States the team is called back into action to answer an attack on the Line of Succession. Terrorists had penetrated the military itself, posing as National Guard troopers and even going so far as to obtain the days safety word.