I'm suppose to go on duty at 0800 hours.
He was seen drinking on duty.
She will be on duty from noon to six.
The base camp housed the emergency response helicopters for Tucson and neighboring sectors and was manned with a skeletal crew of Guardians and one on-duty pilot, a Natural who'd been trained to fly.
Only little Lydia—who I understand was Jill-on-the-job and busted you for racing on her first day on duty.
I'm mighty glad to see her back on duty after only a half day off!
No. It was afternoon and I had to go back on duty.
Only now was he beginning to understand that her staying depended less on duty and honor and more on him.