From the source: SP/4 Ron Dillon, B Co, 2nd Bn, 8th Cav, 1st…

From the source:

SP/4 Ron Dillon, B Co, 2nd Bn, 8th Cav, 1st Air Cav Div, shares his turkey dinner in the field with a dog who had wandered in for the occasion. 10 Nov 1967.

Presumably this was an early Thanksgiving meal for a particular unit.