A World War II historical footnote provides the plot for Jeffrey Sweet's new play: black Wacs trained as medical technicians protest their white commanding officer's racism when he assigns them only menial chores. The story contains few real surprises, but it makes for a sturdy if occasionally heavy-handed docudrama. Andrea J. Dymond's staging is brisk, and Mary Griswold's movable set pieces use the space to good effect. Sweet effectively builds the relationships between the women, especially Ericka Ratcliff's proud Virginia and Samantha D. Tanner's short-fused Johnnie Mae, who end up facing a military tribunal. But best is Velma Austin as a stoic black lieutenant torn between her duty and institutional injustice. --Kerry Reid a Through 3/11: Tue-Thu 7:30 PM, Fri 8 PM, Sat 5 and 8:30 PM, Sun 3 PM, Victory Gardens Theater at the Biograph, 2433 N. Lincoln, 773-871-3000, $30-$45.