Claim: Operation Billings commenced on 12 June as 1st Infantry battalions moved progressively north of Phước Vĩnh, then on the morning of June 17 preceded by a moving barrage, the 1st Battalion, 16th Infantry Regiment, entered LZ X-Ray.
Evidence: Operation Billings was a US search and destroy operation conducted by the 3rd Brigade, 1st Infantry Division north of Phước Vĩnh during the Vietnam War. The operation was conducted from June 12 to 26, 1967. The operation commenced on 12 June as 1st Infantry battalions moved progressively north of Phước Vĩnh. On the morning of 17 June preceded by a moving barrage, the 1st Battalion, 16th Infantry Regiment, entered LZ X-Ray.