The potential participation of the Marine Corps in SOCOM has been controversial since SOCOM was formed in 1986. At the time, Marine Corps leaders felt that their Force Reconnaissance units were best kept in the Marine Corps' MAGTF command structure, and that the detachment of an elite Marine Special Operations unit from the Marine Corps would be to the detriment of the Marine Corps as a whole. A re-evaluation following the 11 September attacks and the War on Terrorism, along with new policy established by Secretary Rumsfeld and then-Commandant Gen. James L. Jones at The Pentagon, caused the Marine Corps to work towards integration with SOCOM. The establishment of MARSOC represented the most significant step towards that goal, and followed the establishment of MCSOCOM Detachment One (DET1), a small Marine Corps detachment formed as a pilot program to test Marine Corps integration into SOCOM. It was made up of mostly Force Recon Marines from 1st and 2nd Force Reconnaissance Companies along with other hand-picked support men and served with Navy SEALs under Naval Special Warfare Group One. Detachment 1 conducted a multitude of special operations in Iraq alongside their Special Operations brothers of the sister services. SOCOM conducted a study of the unit's deployment, which clearly indicated success and strong performance. Detachment 1 was disbanded in 2006 soon after the creation of MARSOC. The first of many Marine Special Operations Companies stood up in June 2006.