Aside from the comments (via the CWB Blog):
The Chicago Police Department has canceled days off for three specialized units over the upcoming holiday weekend, according to an email sent to police executives Wednesday night.
Beginning Thanksgiving night, regular days off are canceled for officers assigned to district tactical teams, Crisis Intervention Response Teams (CIRT), and Community Safety Teams (CST), CPD Chief of Operations Brian McDermott said in the email. A copy of the message was provided to CWBChicago by a source.
[…] Normal days off for affected officers will resume Monday morning, November 30, McDermott wrote. He gave no reason for the schedule changes.