 Operation Attleboro grew to be the largest series of air mobile operations to that time, involving all or elements of the 196th Brigade, 25th Infantry Division, 1st Infantry Division and a brigade of the 4th Infantry Division, as well as numerous Army of the Republic of Vietnam and Regional Forces/Popular Forces and Nùngs.In the end, the operation became a Corps operation commanded by II Field Force, Vietnam.In late 1966 interdiction remained a high priority for US forces, and, until the dry season began in earnest, COMUSMACV General William Westmoreland's primary concern remained blocking the three infiltration corridors into Saigon.