Staff Duty Officer, junior officer assigned on rotating basis to oversee Battalion Operations after normal operation office hours.

SDO's cover two evening shifts at Battalion Operations S-3, first shift from 1600 hours [4:00 PM] to 2400 hours [12:00 Midnight], second shift 1200 hours [12:00 Midnight] to 0800 hours [8:00 AM], and reports to the Battalion Executive Officer.