division is located in or just north of the Demilitarized
 Zone. It infiltrated across the DMZ in the period June-August
 1966, but after sustaining heavy casulaties, it
 moved back into the DMZ in September. Three battalions
 of this division are known to be currently operating in
 South Vietnam at present, but the bulk of the division
 is in the DMZ or north of it.
 4. The 341st Division is also located in or just
 north of the DMZ, and in the period from July to December
 1966 SIGINT revealed that it was intended to operate
 in South Vietnam. Since December, however, SIGINT has
 suggested that the 341st is primarily intended for operations
 within the DRV. The 341st was formerly the 270th
 independent infantry regiment, which had as its primary
 function the defense of the North Vietnam side of the
 DMZ and the coastal area in southernmost North Vietnam.
 5. The fifth division currently known to be in MR IV
 is called the "Mid-65 Division." This designation was
 assigned by US intelligence authorities because the unit
 was first noted moving south within MR IV in mid-1965
 and because its North Vietnamese designation was and
 still remains unknown. It appeared to be on its way to
 South Vietnam when first detected in mid-1965 but be
 September it stopped moving south and ever since has
 been located north of Dong Hoi some 30 miles north of
 the DMZ.
 6. The two independent infantry regiments located
 in MR IV are probably there for defensive purposes as
 are the border defense and public security units. The
 primary role or militia forces is also defensive.
 7. On balance, the five North Vietnamese divisions
 in MR IV have all been used to serve the war in the
 south in one way or another. Their very presence in the
 DMZ/southern DRV area contributes, however, to the defense
 of that area.
 
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