Patrick Campbell, legislative director of Iraq and Afghanistan Veterans of America, said the concession may seem unfair to U.S. troops, who have less say in where they go and for how long.
Home-front service attracts Iraq enlistees →
"If you're a G.I. Joe on the ground, this could definitely frustrate you," Mr. Campbell said. "But anything they can do to get Iraqis in there willing to fight, I completely support."