Operation Adelboro has been described as the biggest U.S. action of the Vietnam War. The 43 day operation involves some 25,000 American soldiers in the jungles of Taenin province northwest of Saigon. It cracked open on the toughest and oldest of Viet Cong strongholds. Operation ended last Saturday with a claimed bag of more than 1,100 Communist regulars killed and nearly 2,400 tons of rice captured plus hordes of other supplies.