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Folder, "3 Q BLACK SHIELD Photography, 7/67 - 11/67," Country Files, Vietnam, NSF, Box 88 (Item)
  • and central DRV. 3. North Vietnamese air defenses: The mission of 19 July photographed 166 of the almost 200 usable surface-to-air missile (SAM) sites, including four new sites in the Yen Bai area. Of the 137 sites which could be read out, 12 were occupied