An article yesterday that examined statements by Vice President Dick Cheney and Senator John Edwards in their debate on Tuesday night incorrectly supported Mr. Edwards's statement that millionaires who receive stock dividends pay "a lower tax rate than the men and women who are receiving paychecks for serving on the ground in Iraq." While some military officers may pay a higher rate, most soldiers do not. The monthly pay of enlisted troops in Iraq, as in other combat zones - and the pay of officers there, up to a ceiling - is exempt from federal income taxes.