'BG' (ii) was the designation of Allied convoys (together with a numerical suffix) plying the route from Milne Bay or other ports of Papua to destinations farther to the west in New Guinea, and as such reciprocals of the 'GB' series (July 1944).

The first of these convoys was BG.1 of 12/15 July 1944 with 15 merchant/transport vessels and five escorts. The merchant and transport vessels were the 7,212-ton US Benjamin Waterhouse, 2,606-ton US City of Fort Worth, 2,609-ton US City of Houston, 12,097-ton US David C. Shanks, 2,704-ton US International, 7,176-ton US John Constantine, 7,176-ton US John Evans, 3,506-ton Panamanian Ponce, 7,176-ton US Samuel Seabury, 14,812-ton US Willard A. Holbrook, 7,176-ton US William D. Boyce, 7,176-ton US William H. Moody, 845-ton US commissioned gasoline tanker Sakatonchee, and the 512-ton US FP-152 and FP-154.