Hi Sgt. Grit,
Enclosed is a picture of one of the mortar crews stationed at the firebase located at Conthien back in February of 1968. The Battery was Whiskey 2/12 and consisted of 6 guns, one of those being a 4.2 in Howtar (half howitzer, half mortar), located at the center of the battery. That particular gun had the wheels removed and was nailed on top of a wooden platform in which had to be greased with axle grease in order for it to traverse. (2nd picture). After many months of service, this gun was later on removed and sent to a museum somewhere in the States.
Bobby (Hobo) Hancox Vietnam 67/68