The brigade was reorganized in March 1968 for Vietnam deployment and was in-country and ready to operate by Aug. 1, 1968.

Since November 1968, the 1st Brigade has been fighting a different war, having moved a few miles south of the DMZ to the Quang Tri area for search and clear, cordon and sweep operations. The brigade spends much of its time working with the Vietnamese Army and is constantly conducting a variety of civic action programs.

In addition to these small unit actions the brigade, from time to time became involved in 3rd Marine Division operations and since March 1969, has been out on the Khe Sanh plains twice and up to the vicinity of the "DMZ to aid the Marine elements of the command. The 1st Brigade has also maintained close contact with local ARVN, RF and PF forces. During the province elections in March 1969, there were no known acts of terrorism in the brigade's area of operation. The mission of the 1st brigade is thus twofold: to conduct major operations against NVA elements and to provide peace and freedom to the residents of the Quang Tri area.