ore pictures from The Junk Blue Book – Marion C. Dalby. Some history background: in the early 60s, Northern Vietnam government (DRV) started an infiltration campaign to support the Southern communists by way of sea. The task force, designated: Group 579, deployed numerous boats, built and camouflaged as Southern fishing or cargo boats, smuggled weapons and war materials onto various spots along southern coast below the 17th parallel. The advantages of secret lines of boats are obvious: only need a small number of well – trained sailors, much larger cargo capacity, harder to trace and intercept (compared to e.g: transporting by trucks, which required lots of labours for road building and protecting, which is hard to keep secret).
The US Navy took countermeasures, first by carrying out a study on VN indigenous boats: designs and constructions, outer appearances, sail plans, navigational equipments, operational zones and routes, methods and habits of fishing… in an effort to help identifying which are real Southern VN boats, and which are camouflaged Northern ones. The result is The Junk Blue Book, the study was taken place at a time when the majority of VN boats (over ~ 70%) was still operating primarily on sails. Ironical facts of history, that a work conducted initially against Vietnamese people, has now turned into a record of knowledge on Vietnamese sailing tradition, a tradition that has been long forgotten by its owner, very few people still care or even aware of it nowadays!