Operation Fillmore

Operation Fillmore was an operation conducted by the 1st Brigade, 101st Airborne Division in Phú Yên Province, lasting from 26 March to 21 July 1966.

Prelude
Operation Fillmore was a continuation of the harvest security operations of Operation Harrison.

Operation
The 1st Battalion, 327th Infantry Regiment was retained as a reserve force at Tuy Hoa Air Base, while the 2/327th Infantry and the 2nd Battalion, 502nd Infantry Regiment patrolled the rice-growing plains and the western foothills.

In early April, 2/502nd Infantry was rotated to Tuy Hoa Air Base and 1/327th and 2/327th began a block and sweep operation in the mountains northwest of Tuy Hòa. On 7 April a company from 1/327th engaged an entrenched company-sized force, killing 28 defenders.

Given that the PAVN had apparently withdrawn from the Tuy Hòa Valley, on 9 April 1/327th and 2/502nd were redeployed, leaving only the 2/327th Infantry to continue operations.

Aftermath
Operation Fillmore officially concluded on 21 July, the US claimed PAVN losses were 134 killed and 35 captured, U.S. losses were 8 killed.