Composer and playwright Quiara Alegria Hudes structures her play as a fugue for mostly solo voices. Though she has an ear for the melodies of language, she hasn't fleshed out her characters--three generations of soldiers in the same Puerto Rican family--or their relationships to create an emotionally engaging piece. The bad food, comradeship under fire, bravado turned to fear, and other details of combat are familiar and insufficiently urgent. Though Meighan Gerachis is outstanding as the gardening-obsessed wife of one soldier and the mother of another, and Lisa Portes stages this coproduction by Rivendell Theatre Ensemble and Teatro Vista with appropriate spareness, the story's richer notes remain frustratingly out of earshot. --Kerry Reid a Through 12/10: Thu-Sat 8 PM, Sun 3 PM, Wed 11/22, 8 PM, no show Thu 11/23, Steppenwolf Theatre Company, Merle Reskin Garage Theatre, 1624 N. Halsted, 312-335-1650, $20-$22.