Well FAST (Fleet Anti-Terrorism Security Teams) are deploy-able force protection teams. When the Cole was bombed a FAST element was sent to provide force protection to the ship and the recovery effort. They are often sent to embassies to bolster their defenses.
Somewhere a True Believer is training to kill you. He is training with minimum food and water, in the worst of conditions, day or night. The only thing clean on him is his weapon. The True Believer doesn’t care how hard it is. He knows he either wins or he dies. He doesn’t go home at 1600. He knows only his CAUSE.