DES MOINES, Iowa - School districts that plan to reopen classrooms in the fall are wrestling with whether to require teachers and students to wear face masks — an issue that has divided urban and rural schools and yielded widely varying guidance.The divide has also taken on political dimensions in Iowa, among other places, where Democratic-leaning cities like Des Moines and Iowa City have required masks to curb the spread of the coronavirus, while smaller, more conservative communities have left the decision to parents.“It’s a volatile issue,” said Mike McGrory, superintendent in Ottumwa, a district in the state's southeast corner with 4,700 students. “You have to be very sensitive and realize there are lots of perspectives.”McGrory said it.