The Army has summoned the top U.S. commander in Iraq back to Washington to preside over a board that will pick some of the next generation of Army leaders, an unusual decision that officials say represents a vote of confidence in Gen. David H. Petraeus’s conduct of the war, as well as the Army counterinsurgency doctrine he helped rewrite. The Army has long been criticized for rewarding conventional military thinking and experience in traditional combat operations, and current and former defense officials have pointed to Petraeus’s involvement in the promotion board process this month as a sign of the Army’s commitment to encouraging innovation and rewarding skills beyond the battlefield. Some junior and midlevel officers who have served in Iraq and Afghanistan have been particularly outspoken in their criticisms, saying the Army’s current leadership lacks a hands-on understanding of today’s conflicts and has not listened to feedback from younger personnel. “It’s unprecedented for the commander of an active theater to be brought back to head something like a brigadier generals board,” said retired Maj. Gen. Robert Scales, former head of the Army War College.