Iraqi troops used "ruses" to kill U.S. troops -U.S. AS SAYLIYA CAMP, Qatar, March 23 (Reuters) - The United States said on Sunday that Iraqi troops were using "ruses" to kill U.S. troops invading their country, on one occasion dressing as civilians to ambush them. "There were several incidents reported today in which there were types of behaviour that I can only describe as ruses that were perpetrated by the enemy," Lt.Gen. John Abizaid told a news briefing at Central Command headquarters outside Qatar. He said that in one incident an apparent surrender was followed by artillery fire. "In another...