The battalion operated in the Dong Nai river basin and also the Bien Hoa, Phuoc Tuy and Long Khanh provinces.

[6] During the Battle of Long Tan on 18 August 1966 the battalion fought against Australian Army forces from D Company, 6 RAR supported by New Zealand and US artillery.

[10] Meanwhile, an 80-strong Vo Thi Sau civil labour company commanded by Chin Phuong, comprising mainly women and children, lent support by evacuating the casualties.

[16] One Australian M113 Armoured Personnel Carrier was hit by two rounds from a D445 recoilless rifle detachment, killing the driver and wounding the crew commander and several soldiers.

[18] In September 1979, the battalion was involved in operations against armed FULRO guerrillas in the Chua Chan Mountain/La Nga River area of Xuân Lộc District that were seeking independence for ethnic minorities in Vietnam and Cambodia.

[citation needed] On 23 February 2011, at a formal meeting to discuss arrangements for a memorial for D445 by surviving veterans and government officials, it was stated that during the war the battalion "had wiped out more than 10,000 enemy soldiers, destroyed 120 military vehicles, shot down 20 aircraft, and seized more than 1,800 weapons of different types.