Early on, a man asks who the unit members are. The reply is, "They're the Pros from Dover." The term originated in the 1968 book, "M*A*S*H" by Richard Hooker. It was a description of the way Hawkeye would con his way into fancy golf courses by claiming he was the Pro from Dover. In the movie of the same name, the phrase was used when Hawkeye and Trapper John went to Tokyo to operate on a congressman's son when the hospital doctors failed. Because of that, the term has come to mean experts who come in to fix problems that the members of an organization cannot.
Marks the only time the term 'Delta Force' is used in the entire series. Jonas asks the FBI to check on any potential expert bombmakers including ex-members of the Rangers, SEALs and Delta Force.