The invasion of Laos was the first test of vietnamization.
Step-by-step explanation:
The 1971 incursion of Laos is one of the neglected events of the Vietnam War. The Laotian incursion was anticipated to be a follow-up to the 1970 Cambodian invasion and was likewise designated as a “limited objective offensive” pointed at obstructing the progress of North Vietnamese armed rations into South Vietnam.