Word: terraine
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...ARVN advance was almost glacial -slowed by twisting terrain, mud that sucked at tank treads, and fears of rushing headlong into what Vice Premier Nguyen Cao Ky described last week as "our Dien Bien Phu." Instead of a lightning strike, the ARVN invasion commander, Lieut. General Hoang Xuan Lam, employed a cautious leapfrogging technique designed to keep his troops within range of friendly artillery...
...helicopter has been doing service in Viet Nam since 1962, at first mostly to transport troops. As the Army realized the necessity for rapid mobility in a guerrilla war, commanders began urging Washington to free them from what they called "the tyranny of the terrain." There are now 3,500 helicopters, worth nearly $1 billion, in Viet Nam. With the arrival of the high-speed, heavily armed Cobra in 1967, the ships became flying combat-assault platforms for entire brigades in mass lift operations. More than any other weapon, they enabled the U.S. to fight the guerrillas' kind...
...westward out of three North Vietnamese passes (the Mu Gia, Ban Karai and Ban Raving), which cut through the Annamese mountains, then loops south and east for 200 miles, reaching a width of 50 miles at some points. Studded with lumpy hillocks, the trail network cuts through the precipitous terrain and dense, triple-canopied jungle growth...
...thing, the command ship Kitty Hawk will descend to within 11.5 miles of the moon's surface before releasing the lunar module. Cutting down on the customary 67-mile altitude will conserve some of the lander's limited fuel reserves for the riskier touchdown on the rugged terrain...
...masses along volcanically active cracks in the earth's crust known as mid-ocean ridges. Part of this undersea mountain chain, which girdles the earth like stitching on a baseball, has now been identified as the prime suspect in still another major geological mystery: the raw and atypical terrain of the American West...