Word: air
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Dates: during 2000-2009
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...helicopter crashes as are their counterparts in Iraq. And the reasons for that discrepancy are not to be found in the country's skies, but on the ground - the Taliban's growing footprint has forced the U.S. to be far more reliant on moving troops and supplies by air. And the rugged terrain often makes helicopters the only option, even as the altitudes involved greatly increase the risks...
...insurgents, meaning that many of the 180 U.S. outposts spread across the country can now only be reached by helicopters. "We don't have freedom of movement on the ground," a senior Army logistics officer says. "We're resupplying between 30% and 40% of our forward operating bases by air because we just can't get to them on the ground." (See pictures of a U.S. Marine offensive in Afghanistan...
...machines. The physics of flight make them inherently unstable, and therefore less reliable, than fixed-wing aircraft which generate their lift from stationary wings instead of egg-beater-like rotor blades. More critically, chopper pilots are commonly expected to fly in hot weather at high altitudes, where less-dense air offers them less control over their aircraft...
...funny thing about sodium azide is that it usually saves lives. That's because, according to the Centers for Disease Control and Prevention, sodium azide is best known for its role in air bags. When a car crashes, an electric charge causes the sodium azide to explode and, in turn, release nitrogen to inflate the air...
Nearly three minutes after Princeton’s first score, Alyssa Pyros batted a shot into the air above the glove of Tassopoulos for her first goal of the game. Pyros struck again two minutes later, this time keeping the ball on the ground as it rolled into the right side of the net, giving the Tigers the commanding 3-0 lead. On Princeton’s third penalty corner in the 16th minute, Donovan got her second score, this time off a pass from Katie Reinprecht...