WASHINGTON – Ten years after the United States went to war in Iraq, one of the most common numbers associated with the conflict is the tally of Americans killed: nearly 4,500. Add in the twin war in Afghanistan, and the tally goes to more than 6,600.

But for the men and women who served in America’s war on terrorism, the number of people affected is far larger. And for many of those people, the impact of the war will last a lifetime.

“I give presentations all over the country, and audiences are routinely shocked and surprised at the numbers,” said Paul Sullivan, a former senior analyst at the Department of Veterans Affairs who handles veteran outreach for Bergmann & Moore, a Washington-area law firm that specializes in disability issues. “Quite often they will challenge me.”