Word: radar
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Beginning two weeks ago and lasting for several nights, allied counter-mortar radar along the eastern edge of the DMZ, where the zone is bordered by the South China Sea, had indeed showed blips that looked like slow-moving, low-flying aircraft-like helicopters. American artillerymen had also reported sighting a series of strange moving lights near the Ben Hai River, the dividing line between North and South Viet Nam. Artillery and aircraft promptly opened fire on the targets and the blips disappeared...
...crew of only three men. The missiles are not notably precise-at a maximum range of about seven miles, gunners are lucky if they hit within 400 yards of their target-but the lack of accuracy, if anything, enhances their terrorist effect. Despite allied ground and air patrols and radar-guided counterbattery fire, the Communists have thrown almost 400 rocket and mortar rounds at the capital since early May. The gunners have rarely been caught; last week, when 12,000 U.S. and Vietnamese troops fanned out to sterilize the rocket belt, they found little besides scarred firing positions...
Suspicious Ladder. Each Phantom carries anywhere from three to nine cameras, including infra-red equipment, as well as side-looking radar, all linked to the aircraft's navigational gear in order to record precise locations-and trip the camera shutters at just the right millisecond. On return to Udorn, automatic machines swiftly process the film in trailers set up beside the runway, and highly skilled (and suspicious) photo interpreters, or PIs, scan it for hours, looking for the smallest telltale detail: a ladder left at a cave entrance, a small dot of light that might be a campfire, vehicle...
...North Vietnamese had fortified the hills of A Shau with hidden antiaircraft guns, some of them radar-controlled and able to hit a plane at 20,000 ft. Using Russian-made bulldozers, they had widened the old French road running down the valley center, Route 548, to six lanes, and built a brand-new road called 547A that branched off from another road, Route 547, and emerged from the valley aimed straight at the heart of Hue. Such passable weather as A Shau ever knows comes in April and May, and three weeks ago, under the tightest secrecy...
...Force was at a loss to say what was bugging the enormously complicated fighting machine, which carries three tons of electronic gear. After withholding the surviving F-111s from action for a few days, it sent them once again into combat. This time it intends to keep them under radar surveillance at all times so that it will know at least where-if not why-they go down...