He was assigned to western frontier duty until 1846, when he was promoted to first lieutenant.

Sibley was on frontier duty in Texas from 1850-1855.

He followed his unit for frontier duty in Minnesota, Iowa, and Texas.

Miles spent the years before the Civil War on frontier duty battling Indians.

After Florida, French served on frontier duty until 1861.

He served on frontier duty in Texas.

He served on frontier duty in Montana.

He was brevetted second lieutenant of dragoons and served on frontier duty.

And I feel like that would be easier to do on a starship assigned to frontier duty.

From 1849 to 1855, he was on frontier duty in New Mexico.