The fictional account of the United States most secret Special Operations unit, the "Activity."

One day training with Norwegian Special Forces in the snow, the next carrying out a mission in the sweltering heat of the Horn of Africa, life is never boring for America's most secret Special Operations unit. Their current "Black" designation is "Tacit Avenger, operational name Ranger-1, formally known as the Army Intelligence Support Activity, still referred to as the "Activity."

This unit never makes the news and very little is known about them. The unit is unique in the world of special operations in that they have the ability to generate their own intelligence through electronics means and immediately act on it. This is the fictional account of the real unit of nameless, faceless men who silently and without fanfare keep America safe in the ongoing Global War on Terrorism. Their heroism and bravery only known to themselves, upholding the values of Duty, Honor, Country.