In the early 1980s, the recently formed Delta Force participated in its first hostage-rescue operation. Delta has become the US's go-to hostage-rescue force, but during its first outing, the Unit's ...

Keller also breaks down Delta Force operations and skills, as depicted in the hostage rescue scenes in "White House Down," starring Channing Tatum and Jamie Foxx; and "Land of Bad," starring Liam ...