Highlighting the ship's deployment to the western Pacific, "Warbler" conducted numerous tours of duty on "Operation Market Time" patrols off the coast of Vietnam to aid in the interdiction campaign to cut off the flow of arms and munitions to the Viet Cong in South Vietnam. A small wooden craft especially designed for coastal minesweeping operations and deployments lasting from a few days to several weeks, "Warbler" and her sister minesweepers filled the gap between the heavier units of the fleet, like the destroyers and destroyer escorts, and the small craft used for patrol work, until built-for-the-purpose patrol craft could enter the fray. During her "Market Time" cruises, "Warbler" boarded many junks, ascertaining cargo and destination; investigated contacts of steel-hulled vessels picked up on radar; and endured what at times appeared to be "fearfully strong weather that seemed bent on total destruction" of the ship. At times, boarding of junks was an impossibility because of the vagaries of monsoon-type weather.