The invasion of laos was the first test of
operation rolling thunder
total containment
operation tonkin
vietnamization

The invasion of Laos was the first test of vietnamization.

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.

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