OPERATION HUMP
I have come to find out that the battery participated in Operation Hump. It is described on the internet. A jeep mounted recoilless rifle protection our convoy as it moved into position.

"Operation Hump was a search and destroy operation initiated on 8 November 1965[1] by the 173rd Airborne Brigade, in an area about 17.5 miles (28.2 km) north of Bien Hoa." Source: http://en.wikipedia.org/wiki/Operation_Hump