As a source of firsthand information about American soldiers’ experiences in the Iraq war, “In Conflict,” a documentary theater project now at the Barrow Street Theatre, is irreproachable. Artistically, however, Douglas Wager’s adaptation of Yvonne Latty’s nonfiction book has some problems — primarily a tendency to add histrionic flourishes to material that needs no further amplification. It’s a pity that Mr. Wager, who also directed, couldn’t resist the temptation to stage exaggerated marching…

As a source of firsthand information about American soldiers’ experiences in the Iraq war, “In Conflict,” a documentary theater project now at the Barrow Street Theatre, is irreproachable. Artistically, however, Douglas Wager’s adaptation of Yvonne Latty’s nonfiction book has some problems — primarily a tendency to add histrionic flourishes to material that needs no further amplification. It’s a pity that Mr. Wager, who also directed, couldn’t resist the temptation to stage exaggerated marching…