With an organization as large as the U.S. Postal Service, it’s essential to move mail under any contingency, including when postal workers go on leave. Making sure the work gets done requires efficiently shifting personnel, which may mean USPS incurs additional costs, such as having to pay overtime to other employees. Sometimes workers take leave without giving prior notice, and if they can’t be granted unscheduled leave status, they may be designated as Absence Without Leave (AWOL). Put simply