'MV' was the designation of Allied convoys (together with a numerical suffix) plying the route from Milne Bay, Papua, to Townsville, Australia (December 1943/March 1944).
There were 31 such convoys starting with MV.45 of 2/4 December 1943 with the 5,681-ton US West Cactus to MV.75 of 23/28 March 1944 with the 2,609-ton US City of Houston and 2,354-ton Dutch Van den Bosch.