 1 was operated by 24 Squadron of the Pakistan Air Force.Older accounts of the "Little Cloud" operation give the original reason for the RB-57F deployment to Pakistan as being the monitoring of Communist Chinese nuclear tests, which began in October 1964.The aircraft were said to have been flown by USAF crews during these operations, and one of the RB-57Fs was reported to have returned to its U.S. base before the outbreak of hostilities with India while the other remained.