On Tuesday he faces two opponents in a quest for a third four-year tour.

The same year, he became a citizen and enlisted for a four-year tour in the Marines.

He relocated to Tokyo the following month to begin his four-year tour.

The Hisa worked in four-year tours of duty on the station.

The armed service chiefs traditionally serve only one four-year tour, but the law allows them to be reappointed in times of national emergency.

They serve four-year controlled tours of special duty that can be renewed.

She was eight months from the end of her four-year tour.

He then joined the Air Force and spent a four-year tour of duty in Europe.

After his four-year tour as Chief of Engineers, he retired on June 18, 1924.

Admiral Watkins retired in 1986 after a normal four-year tour.