The Joint Chiefs of Staff have warned lawmakers that any delay in funding continuing operations in Iraq and Afghanistan could impair U.S. forces' ability to prepare to deploy and compromise future readiness and "strategic agility." The four service chiefs, in a show of unity reserved for the most pressing issues, have set their names to an April 2 single-page letter delivered to key congressional leaders urging quick passage of the fiscal year 2007 emergency supplemental spending bill -- a package...