SFOD B-56 Project Sigma teams abducted POWs back from the enemy in the Fish Hook area of war zone C. An enemy telephone line was located, tapped, and conversations recorded. Other teams placed electronic surveillance devices, set mechanical ambushes, and a host of electronic devices to hinder and harass the enemy along infiltration routes into South Vietnam.
SFOD B-56 Project Sigma's Road Runner Teams were transferred over to SFOD B-57 project Gamma in 1967. SFOD B-56 Project Sigma also assisted and acted as forward reconnaissance elements in several Black Jack operations which were conducted in its area of operations. In November 1967 operational control of SFOD B-56 was given directly to MACV whereupon B-56 was placed under the control of the II Field Force.