Limited objective airmobile operations were mounted to engage PAVN forces in the piedmont area including periodic interdiction of the A Sầu Valley.

At 19:30 on 9 December the 3rd Brigade's provisional air cavalry platoon 2.5km north of Firebase Sword (16°33′11″N 107°16′16″E / 16.553°N 107.271°E / 16.553; 107.271) received 17 mortar rounds on their position and called in artillery support in response.

In the early morning of 21 December Company C, 3/187th engaged 30 VC with small arms and then called in aerial rocket artillery and AC-119 gunship support killing three PAVN and capturing three and two AK-47s.

On the morning of 24 December 3rd Platoon, Company D, 1/327th was ambushed 6km south of Firebase Tomahawk losing one killed.

[1]: 10–11 On 3 January an OH-6 and two AH-1G helicopter gunships from Troop A, 2/17th Cavalry received heavy automatic weapons fire.

On 3 and 4 January a battery of 105mm howitzers guarded by Company D, 2/502nd were moved to reopen Firebase Thor (16°07′12″N 107°29′17″E / 16.12°N 107.488°E / 16.12; 107.488) to engage targets with artillery fire.

From 8–10 January Brigade units assisted in cordon and search operations in Phú Lộc and Phong Điền Districts.

[1]: 11 On the morning of 14 January while supporting United States Marine Corps reconnaissance operations a UH-1H helicopter from Troop F, 2/17th Cavalry was hit by small arms fire and crashed with four U.S. personnel killed.

On the afternoon of the 25th an OH-6A from Troop B, 2/17th Cavalry located a suspected base area and directed airstrikes against it resulting in 16 PAVN killed.

On 27 January the forces engaged in the search were repositioned to prepare for any PAVN/VC attacks on populated areas during the Tết period.

[1]: 12 On the evening of 27 January a unit from Company A, 3/187th assisting a security mission in Phong Điền District observed three PAVN.

The command and control UH-1H illuminated the area with its landing lights and was hit by PAVN fire and crashed killing the battalion artillery liaison officer.

[1]: 13 At 01:00 on 11 February the headquarters of 2/502nd the ARVN 4/54th at Firebase Rifle (16°15′22″N 107°41′10″E / 16.256°N 107.686°E / 16.256; 107.686) was hit by mortar fire followed by a sapper attack.

[1]: 15 On 2 March an OH-6A received ground fire killing the pilot and wounding the observer who took control of the helicopter which he crash-landed at Camp Sally.

A PAVN/VC force then attacked the firebase from the south supported by mortar, RPG and small arms fire.