Kevin,
That photo is from the cover of the VHPA Annual.
They did provide a very good account of Lam Son 719.
It should be noted that one operation resulted in the loss of one heck of a lot of guys and helicopters....probably the most intense action of the war especially for the numbers of people and aircraft involved.
That is a story that needs telling especially for those that wish to compare Malaya to Vietnam as has been done so often in the past.
This link has data on the losses and some excellent audio of radio chatter....very sobering to listen to.
Lam Son 719
Another account of downed aircrews....with a Mayday call being recorded.
174 AHC Unit History, Witch Doctor shoot-down
Welcome Home Kev!