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File Photo: An Ah-64A Apache Anti-Tank Helicopter Of The Armed With Agm-114A Hellfire Anti-Tank Missiles, Is Prepared For A Mission During Operation Desert Storm February 27, 1991. U.S. Defense Secretary William Cohen Said On April 5, 1999 That Plans To Send 24 Tank-Hitting Apache Helicopters Into Yugoslavia Were Not A Prelude To Deploying Ground Troops To Defeat Serb Forces. The Low-Flying Apache Helicopters Are More Vulnerable To Anti-Aircraft Fire And Cohen Conceded That They Posed A Higher Risk For U.S. Troops Than The Current Air Campaign, But That This Was "Part Of The Equation." (Photo By U.S. Army/Getty Images)