Provides a fascinating insight into America's most mysterious law enforcement agency. They are a highly trained guardian force, which protect both American and visiting foreign leaders. It is their responsibility to be wary of each and every potential threat, however their work must remain invisible to the public. It is a high-risk job and they face the constant threat of personal danger. Learn more about the classified technology, specially designed weapons, bullet-proof fabrics, secret strategies and human courage that combine to provide the best protection possible.